A Synopsis of the British Mosses / Containing Descriptions of All the Genera and Species, (With Localities of the Rarer Ones) Found in Great Britain and Ireland, Based Upon Wilson's "Bryologia Britannica," Schimper's "Synopsis," Etc.

by Charles C. P. Hobkirk

ANALYSIS OF GENERA.

Sect. I. ACROCARPI.
Fr. terminal (or in a few instances cladocarpous).
Division A. Capsule without a deciduous lid.
a. caps. bursting irregularly.
Archidium (3). Perennial; caps. globular, sessile; calyptra thin and membranous, irregularly torn in the middle; spores large; infl. monoicous; barren fl. gemmiform, two-leaved or naked in axils of perichætial leaves.	PAGE [26].
Phascum (4). Annual. Caps. ovate or roundish, very shortly pedicillate; calyptra campanulate; spores small, roughish; infl. monoicous; barren fl. gemmiform either at base of plant, or axillary, rarely terminal and discoid.	[26].
b. caps. bursting regularly.
Andreæa (1). Caps. oval erect, opening by four longitudinal slits, sessile on a stalked vaginula; calyptra mitriform, thin; spores small, at first clustered together in fours: perennial.	[21].
Division B. Capsule with a deciduous lid.
I. Peristome none.
a. caps. sessile on a stalked vaginula.
Sphagnum (2). Perennial, aquatic; caps. globular, sessile on the turbinate fleshy stalked vaginula; lid flattish, calyptra surrounding the ripe caps., ruptured near the middle; spores as in Andreæa. Infl. monoicous or dioicous.	[23].
b. caps. pedicillate; vaginula sessile.
α. caps. cylindrical; lid with a straight beak; calyptra mitriform.
Encalypta (29) (In part). Caps. erect, regular, oblong or ovate-lanceolate, smooth or striate, lid conical with a longish almost filiform beak; calyptra very large, covering the capsule, fringed at base (peris. when present of 16 teeth, inner of 16 alternating erect cilia). Infl. monoicous or dioicous; barren fl. gemmiform, axillary or terminal.	[74].
β. caps. oval, lid with an oblique beak; calyptra dimidiate.
Gymnostomum (5). Perennial; leaves of close firm texture, with small dense areolæ; barren fl. gemmiform, in monoicous species placed near the base of perichætium.	[31].
Pottia (21). Annual or biennial; l. rather succulent, with lax quadrate or rectangular areolæ, the lower ones enlarged. Infl. monoicous; barren fl. near the fertile, naked, or gemmiform with three leaves.	[55].
γ. caps. roundish-pyriform; lid obliquely rostrate.
Stylostegium. (12). Perennial; caps. on a very short pedicel; calyptra small, cucullate, scarcely covering the lid; l. channelled, secund. Infl. monoicous; barren fl. gemmiform.	[38].
Anodus (11). Annual or biennial; caps. pedicillate; columella free; l. setaceous, erect.	[38].
δ. caps. obovate or clavate; lid plane or conical; l. loosely reticulated.
* Calyptra mitriform.
Schistostega (70). Caps. small oval, lid convex; calyptra small, at length dimidiate; infl. dioicous terminal, barren fl. gemmiform; l. nerveless, vertically distichous, very tender, areolæ large rhomboid.	[135].
Physcomitrium (59). Annual or biennial. Primary stem terminated by a discoid barren fl. from below which rises a branch bearing a terminal fertile fl.; caps. clavate, lid convex; calyptra large inflated; l. spreading every way, nerved; areolæ large oblong, acute.	[127].
* * Calyptra dimidiate.
Œdipodium (69). Caps. with a long tapering apophysis, gradually passing into the fruit-stalk; lid plano-convex; infl. monoicous or synoicous; l. succulent broad, obtuse; areolæ roundish hexagonal, larger at base.	[135].
ε. caps. globose; lid almost plane.
* Calyptra conico-mitriform, small; l. nerveless.
Hedwigia (30). Caps. immersed, sub-sessile; infl. monoicous, barren fl. axillary gemmiform; areolæ small quadrate, longer and flexuose below.	[76].
Hedwigidium (31). Caps. exserted on a short pedicel; barren fl. terminal; stem stoloniferous; l. plicate longitudinally, areolæ longer.	[77].
* * Calyptra dimidiate; l. nerved.
Bartramidula (60). Caps. on a curved pedicel, smooth, cernuous; infl. synoicous; lid small sub-conical; calyptra small cucullate; areolæ lax, oblong-hexagonal.	[128].
II. Peristome single.
Sub-div. I. Calyptra mitriform.
† Calyptra plicato-striate.
a. teeth four.
Tetraphis (38). Perennial, caulescent, cæspitose; per. teeth long rigid, with irregular longitudinal lines; areolæ hexagonal.	[98].
Tetrodontium (39). Annual, stem none, gregarious; l. few, very minute.	[99].
b. Teeth 16, equidistant.
Ptychomitrium (35). Caps. erect, regular, tapering at base, annulus large, lid conico-rostrate; teeth bifid, not hygroscopic; calyptra deeply furrowed, mitriform, subulate above, shorter than capsule; infl. monoicous; barren. fl. gemmiform, generally axillary.	[89].
c. Teeth 16, in pairs.
Glyphomitrium (34). Calyptra large ventricose laciniate below, entirely covering the capsule, contracted at the base; Infl. as in last; per. teeth hygroscopic reflexed when dry.	[88].
Orthotrichum (36). (partly) Perennial in round tufts; caps. erect, immersed or exserted, pear-shaped or elliptical, with 8, rarely 16, coloured striæ; peristome either single or double, sometimes absent; outer of 32 teeth, connected so as to seem 8 or 16, broad and flat, inner of 8 or 16 equal cilia, or 16 alternately shorter ones; lid short, conico-rostellate; calyptra large campanulate, with about eight furrows, base somewhat torn, and mostly covered with short hair-like processes, but not contracted.	[89].
† † Calyptra smooth, not plicate.
a. Teeth 16, equidistant.
* Perennial, caulescent, cæspitose.
Encalypta (partly) [29.] vide ante. p. 2.
Schistidium. Caps. immersed, obovate or roundish, mouth wide; calyptra small, conico-mitriform, columella adhering to the deciduous lid; teeth large, barred, without medial lines, often perforate. Infl. monoicous or dioicous (included in Grimmia).
Grimmia (32). Caps. pedicillate, seta often flexuose, ovate or oblong, rarely ventricose, sometimes striated, teeth large lanceolate, barred, perforate, bi-trifid; calyptra five-lobed at base, sometimes dimidiate; columella free. Infl. monoicous or dioicous.; areolæ small dense, larger at base.	[77].
Racomitrium (33). Caps. oblong, erect, smooth, on a straight pedicel, teeth bi-trifid, sometimes very long, sometimes short, filiform unequal; calyptra large, with a subulate solid papillose beak, lid conico-subulate, straight; leaves with sinuous areolæ. Infl. dioicous.	[86].
* * Annual or biennial, gregarious; leaves setaceous.
Campylostelium (8). Caps. drooping, on a bent seta oblong, smooth; teeth long lanceolate, barred, entire at base, cleft at summit, and connected by a membrane at base; calyptra small, conico-subulate, five-cleft at base. Infl. monoicous; barren fl. gemmiform; areolæ minute, much enlarged and diaphanous at base.	[36].
Brachyodus (9). Caps. oblong sub-striate, teeth very short truncate, partly confluent, equidistant; lid convex with a slender beak; calyptra conical, three to five-lobed at base, sub-dimidiate. Infl. monoicous gemmiform. St. very short, annual or biennial.	[36].
b. Teeth 16, in pairs, plane, reflexed when dry.
Splachnum (65). Caps. sub-cylindrical or ovate, on a very large spongy coloured apophysis; teeth lanceolate oblong obtuse, plane, yellowish; calyptra small, entire or lacerated at base. Infl. generally dioicous; barren, fl. capituliform, naked or with small scattered leaves.	[133].
c. Peristome a conical plicate membrane.
Diphyscium (41). Caps. very large sessile, oblique ovate, gibbous; calyptra small, entire at base, scarcely covering the conical lid.	[99].
Sub-div. II. Calyptra dimidiate.
a. Calyptra inflexed at base, at first conico-mitriform, caps. clavato-pyriform; teeth 16 or 32 plane, more or less paired, with a medial line.
Dissodon (68). Caps. oval, with a long solid tapering neck, lid conico-convex, obtuse, teeth 32, united into eight bi-geminate teeth, or into 16 pairs, linear-lanceolate, incurved when dry; leaves obtuse entire. Infl. monoicous or synoicous, barren fl. gemmiform.	[134].
Tayloria (67). Caps. with a long clavate or sub-pyriform neck; teeth 16, or 32 cohering in pairs, reflexed when dry; leaves acuminate serrated. Infl. monoicous; barren fl. capituliform.	[134].
b. Calyptra not indexed at base.
* Teeth in eight pairs, reflexed when dry.
Tetraplodon (66). Caps. with a solid clavate or oval apophysis wider than itself; leaves loosely reticulated, acuminate. Infl. monoicous, barren fl. gemmiform or capituliform, 3–5–leaved.	[134].
Zygodon (37) (partly). Caps. erect, pyriform, striated, apophysate. Perist. double, single, or absent; outer teeth 32 united two or four together, representing 16 or 8 plane teeth, inner of 8 or 16 cilia, alternating; calyptra small cucullate smooth oblique, lid obliquely rostrate; leaves minutely dotted.	[97].
* * Teeth 16 equidistant, simple, or nearly so.
‡ Caps. pyriform or oval, erect or inclined.
Entosthodon (58). Caps. erect, pyriform, symmetrical; lid plano-convex, teeth short and broad triangular; calyptra inflated below, cucullate; leaves loosely reticulated.	[127].
Mielichhoferia (53). Caps. pyriform, inclined or horizontal, on a slender curved seta; calyptra small, not inflated; teeth longer, linear-subulate, confluent and dilated at base.	[124].
Blindia (13). Caps. roundish, turbinate-erect; teeth 16 lanceolate, remotely barred, entire or perforate, sometimes cleft; calyptra angular at base, afterwards cleft on one side; seta short; perennial cæspitose.	[39].
Seligeria (10). Caps. roundish-pyriform, smooth, teeth lanceolate obtuse, sometimes perforate, without medial line; calyptra small cucullate; leaves setaceous; stems annual or biennial gregarious, not cæspitose. Infl. monoicous, terminal gemmiform.	[37].
Brachyodus (9). See page [6].
Rhabdoweissia (7). Caps. shortly oval, eight-striate, wide mouthed, teeth lanceolate or subulate, barred, without medial line; beak slender, inclined; calyptra cucullate; leaves channelled lax; stems perennial, cæspitose.	[36].
Weissia (6). Caps. oblong-ovate, smooth, teeth lanceolate or linear-lanceolate, free at base, without medial line, convex, sometimes perforate and bifid; leaves of close texture; stems as above.	[33].
Anacalypta (22). Caps. oval on a long straight pedicel; teeth united at base by a membrane, plane, lanceolate, entire or perforate, no medial line; leaves succulent with lax areolæ; stem annual or biennial.	[57].
‡ ‡ Caps. globose, nearly horizontal.
Discelium (64). Almost stemless; caps. decurrent into the suddenly bent neck; teeth lanceolate, cleft half way from base upwards; leaves few minute, gemmiform.	[133].
Catascopium (63). Caps. smooth, shining, neck bent, and tapering into the seta, mouth somewhat oblique; teeth short truncate, irregular, barred, with a medial line; leaves numerous, nerved, of firm texture.	[132].
Conostomum (62). Caps. cernuous, obscurely furrowed when dry; teeth linear-lanceolate, barred, converging and united together into a cone; perennial.	[132].
* * * Teeth 16, deeply bifid, equidistant.
‡ Caps. erect, symmetrical.
Desmatodon (23). Caps. oval or oblong, sometimes almost pendulous; teeth subulate, united at base by a membrane, bi-trifid; lid rostellate; leaves soft broad, papillose at back.	[58].
‡ ‡ Caps. sub-erect, rather unequal.
Cynodontium (15). Caps. ovate-oblong, or obliquely sub-pyriform, smooth, teeth lanceolate, connivent, dilated at base, entire or cleft to base, sometimes barred, deep red; lid rostrate.	[39].
Arctoa (14). Caps. oval or almost turbinate, striate, contracted below the wide mouth when dry; teeth lanceolate subulate, cleft, or perforate and entire, bars not prominent; lid large, obliquely rostrate.	[39].
‡ ‡ ‡ Caps. cernuous or inclined, unequal.
Dicranum (16). Caps. mostly cernuous, smooth or striated, regular, gibbous or curved, with a tapering apophysis, or sometimes strumose, teeth equidistant, confluent at base, incurved, lanceolate, cleft half way into unequal portions, barred, occasionally perforate, with a medial line; lid rostrate oblique; leaves of close texture, nerved and more or less secund; areolation linear at the base.	[40].
[Dicranella. Plant smaller than in Dicranum, and less robust, areolation rectangular at the base, in other respects similar.]
Leucobryum (17). Caps., lid and peristome as in Dicranum. Leaves spongy, composed of a double layer of loose cellular tissue, white or pale glaucous green, sub-secund, nerve indistinct.	[49].
Fissidens (71). Caps. cernuous or erect, more or less truncate, teeth long and tapering from a lanceolate base, cleft half way into unequal segments, geniculate, barred; fruit in some species cladocarpous, leaves vertically distichous.	[135].
Ceratodon (18). Caps. sub-cylindrical unequal, with a short ventricose or strumose neck; teeth deeply cleft, or of two equal subulate portions connected below by prominent trabeculæ, of two differently coloured laminæ, the outer red, the inner and broader yellow.	[49].
‡ ‡ ‡ ‡ Capsule on an arcuate seta.
Campylopus (20). Caps. oval or oblong, regular or gibbous on upper side, tapering at base, striated, lid conico-subulate or rostrate, teeth deeply bifid; calyptra large, fringed at base; leaves with a broad nerve.	[50].
Dicranodontium (19). Caps. elliptical smooth, teeth linear-lanceolate, cleft nearly to base into unequal portions, obliquely striate; calyptra not fringed at base.	[49].
* * * * Teeth 32, in pairs, narrow or filiform.
Didymodon (25). Caps. erect, sub-cylindrical, teeth 32 (16 Wilson) linear-lanceolate, not obviously united by a basilar membrane, tender and fugacious, entire or perforate.	[58].
Trichostomum (26). Caps. erect, sub-cylindrical or oval, smooth, teeth 32 in unequal pairs (often so united as to appear 16 simple or perforate teeth), connected by a narrow basilar membrane, persistent.	[60].
Distichium (24). Caps. as in last; teeth 32 (16 Wilson) not confluent at base, linear-lanceolate, entire, perforate or cleft, with a medial line; leaves distichous, setaceous from a sheathing base.	[58].
Tortula (27). Caps. mostly erect ovate-oblong, smooth, teeth 32 very long filiform twisted, articulate papillose, outer cellules yellow, inner red, often united into a membrane at base; leaves not distichous.	[63].
Cinclidotus (28). Caps. immersed ovate or oval, smooth, teeth 32 perfect or rudimentary, adhering at top to columella, contorted, anastomosing at base.	[74].
* * * * * Teeth 32 or 64 equidistant, short, obtuse, connected at apex by a tympanum, formed of dilated apex of columella; nerve of leaf covered with vertical lamellæ.
† Caps. not angular.
Atrichum (42). Caps. cylindrical, erect or cernuous, calyptra narrow, almost naked, spinulose at apex only; teeth 32 ligulate rigid, united at base by a narrow membrane, leaves not sheathing, lamellæ few, nerve narrow. Columella round.	[100].
Oligotrichum (43). Caps. sub-cylindrical, erect, gibbous, peristome as above; calyptra slightly setose at apex; leaves sheathing at base, more lamellated, nerve wider; columella winged.	[101].
Pogonatum (44) Caps. ovate or urceolate, regular, erect or inclined, calyptra very hairy, peristome as above; leaves rigid, densely lamellated, nerve thick and broad.	[101].
† † Caps. angular; teeth 64, rarely	[32].
Polytrichum (46). Caps. with a discoid apophysis, erect, when ripe horizontal; teeth 64 (in some species 32). Calyptra very hairy; leaves as in last.	[102].
III. Peristome double.
a. Caps. plano-convex.
Buxbaumia (40). Caps. very large, apophysate, oblique; outer teeth irregular reddish, opaque, inner a pale conical plicate membrane, calyptra small, only covering the conical obtuse lid, fugacious, entire or laterally cleft.	[99].
b. Caps. cylindrical.
Encalypta (partly) (29). vide ante p. 2.
c. Caps. oblong.
Orthotrichum (chiefly) (36). vide ante p. 5.
d. Caps. obovate, unequal, mouth oblique.
Funaria (57). Caps. obliquely pyriform ventricose, sub-erect or cernuous; outer perist. 16, obliquely lanceolate, teeth trabeculate, longitudinally striate, and connected at apex by a small circular disc, very hygrometric, inner a membrane divided into 16 lanceolate processes opposite to outer; calyptra inflated below.	[126].
Amblyodon (56). Caps. clavate or sub-pyriform, incurved sub-erect; perist. outer, 16 short, erect, obtuse teeth; inner (longer) a membrane divided into 16 carinate processes, without cilia. Calyptra indexed at base; leaves loosely reticulated.	[125].
Meesia (55). Caps, obovate or clavate, curved, gibbous, sub-erect, neck long, tapering into seta; perist. outer 16 short, obtuse teeth, somewhat united to inner, entire or split along medial line; inner same as last; leaves of close firm texture, strongly nerved.	[125].
e. Capsule striated.
Zygodon (37). vide ante p. 7.
Aulacomnion (47). Caps. oval or oblong apophysate, cernuous on a flexuose seta; perist. outer 16 teeth, lanceolate-subulate, barred; inner a thin membrane divided half way into 16 carinate lacunose processes, with cilia two or three together. Branches bearing terminal globular masses (pseudopodia) of rudimentary leaves or gemmæ.	[105].
Bartramia (61). Caps. globose, rather large, erect or cernuous, rarely pendulous, not apophysate; perist. double, single, or wanting; outer 16 equidistant lanceolate teeth; inner a membrane divided into 16 carinate lanceolate processes, splitting along the middle, alternating, sometimes with cilia; calyptra small dimidiate; leaves papillose or muriculate.	[128].
f. Caps. smooth, mostly pyriform.
Paludella (54). Caps. oval-oblong, slightly curved, cernuous or sub-erect, lid mammillate; peristome as in Bryum, inner without cilia; leaves squarrose.	[125].
Timmia (46). Caps. obovate, cernuous; perist. outer 16 teeth, inner, a membrane divided half way into 64 filiform processes; variously united at the summits; leaves sheathing, rigid, lanceolate; barren fl. axillary, gemmiform. Infl. monoicous.	[104].
Orthodontium (48). Caps. clavoto-pyriform, inclined; perist. outer 16 teeth indexed when dry; inner deeply divided into 16 narrow carinate processes; leaves very tender, narrow, not sheathing; barren fl. axillary, gemmiform, aggregate. Infl. monoicous.	[106].
Leptobryum (49). Caps. and perist. as in Bryum; stems of annual growth without innovations; leaves almost setaceous. Infl. synoicous.	[106].
Bryum (50). Caps. pyriform cernuous or inclined; perist. outer 16 teeth, inner a membrane divided half way into 16 carinate segments with or without cilia; stems perennial, with innovations below the terminal flower; barren fl. gemmiform or naked.	[106].
Mnium (51). Caps. oblong pendulous; perist. as in Bryum; stems with innovations from the lower part; leaves large; barren fl. discoid; infl. dioicous or synoicous.	[121].
Cinclidium (52). Caps., leaves and stem as in Mnium, outer teeth 16 short, inner cupuliform.	[124].
Sect. I. b. CLADOCARPI.
Fruit terminal on very short lateral branches.
Div. I. Peristome none.
Sphagnum (2). vide ante p. 1.
Div. II. Peristome single.
Mielichhoferia (53). vide ante p. 8.
Fissidens (71) partly. vide ante p. 10.
Cinclidotus (28) occasionally. vide ante p. 12.
Sect. II. PLEUROCARPI.
Fructification truly lateral.
Div. I. Calyptra dimidiate.
Sub-Div. I. Peristome none.
Anœctangium (72). Caps. oval or obovate, erect, with a short slightly inflated neck; lid conico-convex with a long slender oblique beak; stems erect, cæspitose.	[139].
Sub-Div. II. Perist. single, of 16 teeth.
Habrodon (77). Caps. oval-oblong erect, calyptra large, lid conical; st. sub-erect, l. spreading, nerveless, soft and opaque; per. teeth simple, linear, inserted below mouth of caps., remotely articulate: dioicous.	[141].
Sub-Div. III. Peristome almost single.
a. inner peristome very short and indistinct.
Leucodon (73). Caps. oval erect, on a short pedicel; calyptra large; outer teeth 16 bifid or perforate, not hygroscopic; surculi erect simple; leaves plicato-striate, nerveless.	[139].
Pterogonium (78). Caps. oblong erect, on a long seta; calyptra small; outer teeth 16 simple, hygroscopic; surculi dendroid, with fasciculate curved branches; leaves not striate.	[141].
Leptodon (75). Caps. oval on a very short seta; calyptra and vaginula hairy; teeth 16 linear-lanceolate, entire or fissile, not hygroscopic; surculi pinnate; branches curled when dry; leaves very obtuse.	[140].
Sub-Div. IV. Peristome double.
a. Inner perist. of 16 cilia.
Antitrichia (74). Caps, oval, regular, on a short curved seta; calyptra rather large smooth; inner peristome of 16 filiform processes; outer 16 tapering teeth with a medial line; surculi procumbent, pinnate.	[140].
Anomodon (76). Caps. oval-oblong erect, on a long seta; lid obliquely rostrate; calyptra small; perist. as in last: stems erect with erect branches, cæspitose; leaves of close texture acuminate, nerved.	[140].
Cylindrothecium (81). Caps. cylindrical, regular, erect; outer teeth 16 inserted below mouth of capsule; inner of 16 narrow carinate processes; lid shortly rostellate; stem procumbent pinnate; leaves ovate concave, faintly two-nerved at base.	[142].
Neckera (85). Caps. oval-oblong, immersed or pedicillate; lid obliquely rostrate, outer teeth 16 linear-subulate, long, connivent into a cone; inner as above; stems pinnate; leaves complanate. St. sub-erect from a creeping rhizome.	[182].
b. Inner peristome a membrane divided half way into 16 carinate segments with or without cilia.
* Caps. symmetrical, erect or sub-erect.
Omalia (84). Leaves complanate smooth, falciform, obtuse, serrulate at apex, not undulate (allied to Neckera).
Leskea (82). Perist. outer of 16 narrow barred teeth, inner without (rarely with) intermediate cilia, leaves mostly ovate, nerved or nerveless, entire, spreading every way.	[143].
Climacium (80). Caps. oblong, erect; lid adhering to the persistent columella; outer teeth linear-lanceolate, confluent at base, trabeculate, with a medial line; inner alternate and longer than outer, lacunose without cilia, the two segments of each process united only at apex; stem dendroid, erect.	[142].
Isothecium (79). Caps. oval, sub-erect, symmetrical; lid not adhering to columella; outer teeth 16 barred, with a medial line; inner with intermediate cilia, two or three together; stem dendroid drooping; branches fasciculate or pinnate.	[142].
* * Caps. unequal, cernuous.
Hypnum (83). Caps. cernuous, sometimes nearly erect, rarely pendulous, ovate or oblong, more or less curved, and sometimes slightly apophysate; outer teeth 16 equidistant lanceolate acuminate, barred, inner alternating, often perforate, with intermediate cilia, one, two or three together.	[145].
c. Inner perist. a reticulated cone.
Dichelyma (90). Peristome like Fontinalis; caps. scarcely exserted; calyptra long twisted; leaves nerved.	[185].
Div. II. Calyptra mitriform.
Hookeria (86). Caps. ovate or elliptical, cernuous, lid with a straight beak; perist. as in Leskia; calyptra not fringed at base; leaves complanate, loosely reticulated.	[184].
Daltonia (87). Caps. erect oval-oblong, obscurely apophysate; calyptra fringed at base; leaves spreading every way; inner perist. divided nearly to base.	[184].
Cryphæa (88). Caps. oval-oblong or roundish, sub-sessile, immersed; calyptra conical small, not fringed; peristome as in Neckera.	[184].
Fontinalis (89). Caps. ovate or oval, immersed, sub-sessile; calyptra conical, crenate or slightly lacerate at base, small; outer teeth 16 linear-lanceolate, very long, cohering at apex in pairs, barred, twisted; inner a plicate cone, with 16 angles, consisting of filiform cilia, united by crossbars.	[185].

DIVISION I. ACROCARPI. (Genera 1–72.)

1. ANDREÆA. Ehr.

a. L. nerveless.

1. A. petrophila. Ehr. (A. rupestris Hedw.) St. ¼ inch loosely tufted, with fastigiate branches; l. erect imbricate, with a sheathing base, generally secund, ovate or ovate-subulate, tapering above, and rather obtuse; papillose, areolæ dotted; per. l. larger; all reddish brown.

Sub-alpine rocks, frequent. V. VI.

2. A. alpestris. Schimp. St. taller, densely tufted, with slender branches; l. crowded, very small, patent on all sides when moist, ovate, or ovate-lanceolate, obtuse, areolæ quadrate at margin; per. l. shorter and more obtuse.

Damp alpine rocks. Glen Callater; Perthshire.

3. A. obovata. Thed. “Densely tufted, blackish brown, tall and robust; l. somewhat like those of alpina, from an imbricate base ovate-panduriform, gradually lanceolate, nearly smooth, glossy, quite entire at margin, areolæ much laxer.” Dr. Braithwaite, Jour, of Bot., VIII. p. 95.