HypnaceA.'J 149 [Ctenidium. 



from a decurrent cordate base, lanceolate-subulate, equal or compressed 

 and secund ; nerves two, short or none ; cells very narrow, elongate, 

 smooth. Capsule horizontal, ovate, calyptra more or less hairy, lid 

 convex-conic, peristome perfect. — Der. kt£is a comb, eiSos likeness. 



Clavis to the species. 



Plants soft, radiculose, leaves serrated, papillose. moUuscum. 

 firm, not radiculose ; leaves entire, smooth. procerrimum. 



I. CTENIDIUM MOLLUSCUM (Hedw.) Mitt. 



Dioicous ; stems procumbent or suberect, pinnate ; leaves circinate- 

 secund, cordate-acuminate, serrate, papillose, cells at angles many, 

 quadrate and rectangular, branch-leaves ovato-lanceolate ; capsule ovate, 

 cernuous, lid conical, pointed, (T. CXII, C.) 



Syn. — Hypnum filicinum, cnstam castrensem representans Dill. Hist. muse. 284, t. 36, f. 20 

 (1741) et Herb. 



Hypnum moUuscum Hedw. Descr. iv, 56, t. 22 (1797). Swartz Muse. Suec. 55 (1799). 

 Sm. F1. Brit. 1335 (1804), Eng. Bot. t. 1227. Turn. Muse. Hib. 198 (1804). Web. 

 MoHR Bot. Tasch. 369 (1807). Brid. Sp. muse. II, 208 (1812), Mant. 177 (i8ig), Bry. 

 univ. ii, 519 {1827). Roehl. Deutsch. fl. iii, 114 (1813). Schvitaeb. Suppl. I, P. II, 293 

 (1816). Wahlenb. Fl. Carpat. 361 (1814). Hook. Tayl. Muse. Brit. 114 (1818). 

 FuNCK Moost. 65, t. 52 (1821). Hook. Fl. Scot. P. 2, 148 (1821). Gray Nat. arrang. 

 i, 766 (1821). Hueben. Muse. Germ. 685 (1833). De Not. Syllab. 54 (1838), Epilogo 

 175 (1869). Rabenh. D. kr. fl. II, S. 3, 276 (1848). C. Muell. Synops. ii, 297 (1851). 

 Br. Sch. Bry. Eur. fasc. 57 — 61, p. 29, t. 18 (1854). Wils. Bry. Brit. 395 (1855). Schimp. 

 Synops. 631 (i860), 2 ed. 769. Berk. Handb. 123 (1863). Milde Bry. Siles. 366 

 (1869). HoBK. Synops. 175 (1873). Boulay Muse. Fr. 28 (1884). Lesq. James Moss. 

 N. Amer. 389 (1884). Husn. Muse. Gall. 409, t. 118 (1894). Dix. James. Stud. Handb. 

 478 (1896). LiMPR. in Rabenh. D. kr. fl. Laubm. iii, 447 (i8g8). 



Hypnum crista-castrensis (non L.) Weiss Cr. Goett. 283. Weber, Hudson, Roth, &e. 



Hypnum Timmii Brid. Muse. ree. II, P. II, 123 (1801). 



Ctenidium moUuscum Lindb. Muse. Seand. 38. 



Dioicous; growing in spreading densely matted yellowish-green 

 tufts. Stems prostrate or ascending, pinnate with close short branches 

 spreading horizontally ; paraphyllia ovato-lanceolate, serrate. Stem- 

 leaves from a decurrent cordate base, divergent, suddenly narrowed into 

 a long lanceolate-subulate, falcato-secund point, faintly plicate, margin 

 plane, sharply serrate, nerves obsolete or none; cells at basal angles 

 quadrate, upper projecting at apex in a papilla ; branch-leaves lanceolate, 

 serrate, falcato-secund. Perich. bracts broadly lanceolate, with long 

 slender points, nerveless ; seta short, purple, capsule horizontal, roundish- 

 ovate, gibbous, castaneous, calyptra with a few scattered hairs, lid convex- 

 conic, acute ; annulus of 3 rows, peristome orange. Male infl. ovate with 

 ovate acute serrated bracts. 



