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

16. DICRANUM. Hedw.

a. (Dicranella. Schimp.)

Sect. I. Stem long, rooting in all parts; leaves spreading flexuose, papillose on both sides, crenulate in margin, not nerved to apex; infl. monoicous; beak of lid shorter than caps.

71. D. polycarpum. Ehr. L. bent, flexuose, often recurved, lanceolate-subulate or linear-lanceolate, keeled, margin recurved, somewhat papillose, denticulate at apex, nerve excurrent; caps. erect, symmetrical, striated, with a tumid neck.

Alpine rocks. VII. VIII.

var. β. strumiferum. caps. unequal, base strumose.

Sect. II. St. rooting in all parts, leafy; l. spreading, nerve slightly excurrent; infl. monoicous; caps. strumose.

72. D. virens. Hedw. St. 1–3in. branched; l. erect ovate-lanceolate at base, sheathing, running to a long sub-denticulate, almost setaceous prolongation, margins recurved, nerve thick sub-excurrent; caps. cernuous strumose smooth oblong and curved; lid beaked.

Moist alpine rocks; Ben Lawers. VI. VII.

var. β. Wahlenbergii. l. flexuose, much attenuated, above narrower and longer, yellowish; caps. short, with a very prominent struma.