HvPNACEiE.] 91 [Hypnum. 



rows of cells, teeth lanceolate-subulate, yellow. Male infl. ovate, 

 bracts few entire, nerveless. 



Hab. — Limestone rocks and walls. Fr. 10. 



This pretty species is distinguished by its long narrow leaves and long 

 nerve which is generally in the long narrow acumen, but sometimes only 

 reaches to f the length of leaf; the leaf-cells are also very long and narrow. 



Sect. 5. RHYNCHOSTEGIUM ScUmp. Robust mosses, growing on 

 walls and stones in water or damp shady places. Stem creeping with 

 scattered branches or stolons. Leaves spreading on all sides, from a narrow 

 slightly decurrent base, ovate, pointed, sometimes rounded or with an 

 apiculus, concave, not plicate, with a strong nerve, cells uniform, linear, not 

 vesicular or hyaline at angles, but quadrate. Seta smooth, straight, capsule 

 oval or longish-ovate, cernuous, lid conic with a subulate beak. 



Clavis to the Species. 



Leaves ending in a long filiform point. 



Branching pinnate, leaves spreading. piliferum. 



Branches nearly simple, leaves imbricated. cirrosum. 



oval or oval-oblong. 



Leaves twisted when dry, median cells wide and short. rotundifolium. 



not twisted when dry, linear. 



Leaves broadly oval, pointed. 



Aquatic, leaves serrated, spreading;. rusciforme. 



Not aquatic, leaves imbricated, concave. muraU. 



Leaves acuminate. 



With a broad short acumen. confertum. 



With a long slender acumen. megapolitanum. 



21. HYPNUM PILIFERUM Schveh. 



Dioicous ; stem procumbent, rambling, pinnate with slender 

 branches ; leaves dense, ovato-elliptic with long piliform acumen, 

 serrulate, nerved to middle. Seta rough, capsule ovate-oblong, 

 cernuous, lid rostrate. (T. CII, A.) 



Sytl.—HypnMm piiiferimi Schreb. Spic. fl. Lips, gi (1771). Roth Tent fl. germ, i, 456 (1788). 

 Hedw. Musci frond, iv, 35, t. 14 (1794), Sp. muse. 27 (1801). Hoffm. Deutsch. fl. ii 

 75 (1795)- SwARTz Muse. suec. 65 (1799). Brid. Muse. rec. II, P. II, 162 (1801), Sp. 

 muse. II, 187 (1812), Mant. 173 (1819), Bry. univ. ii, 489 (1827). Smith Fl. Brit. 1319 

 (1804), Eng. Bot. t. 1516. Turn. Muse. hib. 175 (1804). P. Beauv. Prodr. 68 (1805) 

 Web. Mohr Bot. Tasch. 315 (1807). Voit Muse. herb. 102 (1812) et in Sturm 

 Deutsch. Fl. II, 12. Wahlenb. Fl. Carp. 362 (1814). Roehl. Deutsch. fl. iii, log 

 (1813). SCHWAEG. Suppl. I, P. II, 239 (1816). Hook. Tayl. Muse. Brit. 105 1818). 

 Gray Nat. arr. i, 761 (1821). Funck Moost. 60, t. 43 (1821). Hook. Fl. Scot. P. II, 145 

 (1821). Hueben. Muse. germ. 634 (1833). Rabenh. D. kr. fl. II, S. 3, 298 (1848).' C 

 MuELL. Synops. ii, 369 (1851). WiLS. Bry. brit. 347 (1855). Berk. Handb. 86 (1863) 

 HoBK. Synops. 154 (1873). Boulay Muse. Fr. 106 (1884). 



Hypnum cassubicum Dicks. PI. crypt. Fasc III, 10 (1793). 



