GRIMMIACE.E.] 89 [Weissia. 



although the calyptra and texture of the leaf-base are more or less distinc- 

 tive. About 36 species are referable to it, some of which have creeping 

 stems as in the genus Macromitrium. In all our species the stomata are 

 superficial. 



The acute botanist Ehrhart was certainly the first to found a genus in 

 honour of Weiss, the subsequent one of Hedwig applied to Bryum viridulum 

 (Fund. II, 90), dating from 1782 ; Orthotrichum is posterior to both, and if the 

 two are to be united in one genus, it must stand as Weissia. The name Weis 

 on the title of the " PI. crypt. Getting." is no doubt a printer's error, as the 

 correct spelling must be Weiss. 



CLAVIS TO THE SPECIES. 



Leaves rigid, not crisped. Americana. 



crisped when dry. 



Upper leaves tipped with a cluster of gemmae. phyllantha. 



not tipped with gemmae. 



Caps, striate only at the contracted orifice. coarctata. 



all its length. 



Stem creeping, leaves slightly curled, per. simple. Drnmmondii. 



not creeping, 1. strongly curled, per. double. 



Orifice of capsule contracted. Brucliii. 



not contracted. 



Calyptra hairy ; caps, contracted below orifice. itlophylla. 



Calyptra nearly smooth, caps, not contracted below 



orifice. vittata, 



i. WEISSIA AMERICANA (P.Beattv.) Lindb. 



Autoicous ; in rigid, fragile, brown tufts. Leaves erect, nearly 

 straight when dry, lanceolate. Capsule clavato-pyriform, 8-striate ; 

 calyptra campanulate, hairy. (T. LVIII, D.) 



SVN. Orthotrichum americanum P. BEAUV. Prodr. 80 (1805). SCHWAEGR. Suppl. I, P. II, 37, 

 et SuppK II, P. I, 144, t. 138 (1823). BRID. Bry. univ. 278 (1826). 



Orthotrichum anomalum ft. americanum BRID. Sp. muse. II, 10 (1812). 



Orthotrichum Hutchinsice SM. Eng. Bot. t. 2523 (1813). HOOK. TAYL. Muse. br. 73, t. 21 

 (1818). FUNCK Moost. 34, t. 23 (1821). SCHWAEG. Suppl. II, P. I, 145, t. 138 (1823), 

 Flora vi, 55 (1824). BKID. Bry. univ. i, 277 (1826). GRAY Nat. arr. Br. pi. i, 746 (1821). 

 HOOK. Fl. scot. P. 2, 137 (1821), Brit. fl. ii, 56 (1833). HOOK. GREV. Edin. J. Sc. i, 125 

 (1824). HUEBEN. Muse. germ. 353 (1833). MACK. Fl. hibern. P. 2, 30 (1836). BR. SCH. 

 Bry. eur. Fasc. 23, p. 20, t. 10 (1837). DE NoT - Syllab. 154 (1838). RABENH. 

 Deutsch. kr. fl. ii, S. 3, 182 (1848). C. MUELL. Synops. i, 692 (1849). HARTM. Skand. 

 fl. 5 ed. 369 (1849). WILS. Bry. br. 190, t. 21 (1855). HUSN. Mouss. N. ouest 103 (1873). 

 HOBK. Syn. br. m. 96 (1873). 



Orthotrichum strictum BRID. Bry. univ. i, 289. 



Orth. nigricans BRID. Bry. univ. i, 792. 



Orth. nigrititm BR. SCH. Bry. eur. Fasc. 2 3, p. n, t. 4. C. MUELL. Synops. i, 692. 



Ulotrichtun Hutchinsicc SCHIMP. Bry. eur. Consp. 



Ulota Hutchinsice HAMMAR Mon. Orth. suec. 27 (1852). SCHIMP. Coroll. Br. eur. 41 

 (1855), Synops. 255 (1860), 2 ed. 306. BERK. Handb. Br. m. 229 (1863). MILDE Bry. 

 siles. 166 (1869). DE NOT. Epil. bri. ital. 290 (1869). JURATZ. Laubm. oestr.-ung. 194 

 (1882). LESQ. JAMES Moss. N. Amer. 163 (1884). HUSN. Muse. gall. 153, 1.43 (1887). 



Weissia amcricana LINDB. Muse, scand. 28 (1879). 



