2. M. myriópoda, Lindb. Thallus elongated (2´ long, ½´´ wide), dichotomous, the long linear branches of uniform width, convex above, the reflexed margins not undulate; midrib densely pilose beneath; hairs rather long, straight or nodding, the marginal mostly in clusters of 3–6, some with discoid tips; midrib covered above with 2 rows of enlarged cells, and beneath with 3–7 (usually 4–6) rows of smaller cells, lax and often indistinct. (M. furcata, Sulliv., in part; not Nees.)—Shaded rocks and trees in the Alleghanies (Sullivant), and southward.
3. M. hamàta, Lindb. Like the last; thallus much elongated (4´ long, 1–1½´´ wide); hairs very long, divaricate and hooked-deflexed, the marginal in twos, rarely with discoid tips; midrib covered above and below with two rows of enlarged lax cells. (M. furcata, Sulliv., in part.)—Alleghany Mts. (Sullivant).
4. M. conjugàta, Lindb. Thallus 1½´ long, ½–1´´ wide, usually dichotomous, the short branches irregular in width, convex above, the margins more or less undulate; hairs rather long, straight, divaricate, the marginal usually in twos, very often disk-bearing; midribs covered above with 2, below with 3–6 rows of enlarged lax cells.—On shaded rocks and trunks of trees, central N. Y., and southward. (Eu.)
33. ANEÙRA, Dumort. ([Pl. 23.])
Thallus fleshy, prostrate or assurgent from a creeping base; costa obscure. Diœcious or monœcious. Fructification arising from the under side near the margin. Involucre cup-shaped, short and lacerate, or none. Calyptra large, fleshy, more or less clavate. Capsule large, oblong-cylindric. Elaters unispiral, in part adherent to the tips of the valves. Spores minute, smooth or minutely roughened. Antheridia immersed in the surface of receptacles proceeding from the margin of the thallus. (Name from α- privative, and νεῦρον, a nerve.)
[*] Thallus narrow (about 1´´ wide), palmately divided.
1. A. látifrons, Lindb. Thallus cespitose, ascending or erect, usually dark green, 6–9´´ long, mostly pellucid; branches linear, obtuse and emarginate, plano-convex; cells large, oblong-rhombic; monœcious; archegonia 3–10, short, conic; calyptra white, verrucose, pyriform-clavate; capsule oval, brown; spores 12½–14½ µ broad, globose, minutely and densely papillose; antheridia globose. (A. palmata of authors; not Dumort.)—On rotten logs; common.
[*][*] Thallus narrow (about 1´´ wide), pinnate or bipinnate.
2. A. multífida, Dumort. Thallus prostrate, brownish-green, pinnately divided, the primary portion biconvex, somewhat rigid, the branches horizontal, pectinately pinnate with narrow linear divisions; monœcious; fructification rising from the primary part or from the branches; involucre fleshy; calyptra tuberculate.—Var. màjor, Nees. Primary portion and branches thick, the branches interruptedly pinnate with short obtuse divisions.—On decayed wood and moss in swamps, N. J. (Austin), and south in the mountains. (Eu.)
3. A. pinnatífida, Nees. Thallus pinnately divided or subsimple, flat or somewhat channelled; branches horizontal, the broader pinnatifid or dentate, obtuse; calyptra somewhat smooth.—On dripping rocks, Hokokus, N. J. (Austin), N. Haven, Conn. (Eaton). (Eu.)