below, strongly nerved to apex, areolæ minute, larger at base; caps. erect, almost globose, with a reddish mouth and long rostrate lid; per. teeth converging when moist, reflexed when dry; calyp. large, laciniate at base.
Clefts of rocks. VI. VII.
Giant's Causeway; Llanberis; Glenarbuck, May, 1863 (W. Galt and McCartney); New Kilpatrick, Killin (McKinlay); Ardtun Mull (Dr. Black); Skye (Hunt); Blairlogie; Craigallion; Campsie Hills (Thompson and Galt).
35. PTYCHOMITRIUM. B. & S.
229. P. polyphyllum. B. & S. St. ½in. tufted; l. linear-lanceolate from a broadish base, spreading, nerved to the dentate acute apex; caps. elliptical on a long twisted seta; calyp. plicate; lid long subulate.
Mountainous rocks and walls. III. IV.
36. ORTHOTRICHUM. B. & S.
A. Caps. on a very short seta, immersed or shortly exserted;
ochrea distinct, calyptra with about ten furrows.
1. Caps. with 16 furrows.
230. O. cupulatum. Hoffm. St. under 1in.; l. spreading lanceolate keeled, lower brownish, nerve distinct; caps. obovate, urceolate when dry, with a shortly beaked lid; calyp. hairy; perist. simple, of 16 free equidistant teeth, spreading when dry.
Rocks and walls. IV. V.
2. Caps. with eight furrows.
231. O. Sturmii. Hop. & Hornsch. In loose cushions; st. short and erect, or longer and prostrate; l. patent and
