HypNACE^.J 130 [Helicodontiwn. 



lanceolate teeth, curled inward when dry, endostome a wide basal 

 membrane, with 16 carinate processes as long as teeth, or sometimes 

 imperfect, cilia none. — Der. IXi| a twisting, oSous a tooth. 



We have only to look at the plate of H. Umirostre in Schwaegrichen's 

 Suppl, III, P. II, t. 293, to see that there is not a single character to 

 differentiate Myrinia from this older genus ; it contains about 14 species, 

 chiefly inhabitants of S. America. 



HELICODONTIUM PTILVINATUM {Wahlen.) Lindb. 



Autoicous ; growing in very soft, dingy green tufts, branches short, 

 erect. Leaves spreading, ovate, oblique and blunt at points, entire, 

 nerve faint, ^ length ; cells smooth, longish oval, quadrate at angles. 

 Perich. bracts sheathing, long, linear acute, nerveless. Capsule erect, 

 cylindraceous, lid conical. (T. CVIII, E.) 



Syn. — Leskea pulvinata Wahlenb. F1. Lapp. 369 {1812), FI. Suec. ii, 713 (1826). Brid. Sp. 

 Muse. II, in add. (1812), Mant. 147 (i8ig), Bry. univ. ii, 316 (1827). Br. Sch. Bry. eur. 

 fasc. 44 — 45, p. 3, t. 2 (1850). WiLS. Bry. Brit. 331, t. 54 (1855). De Not. Epilogo 246 

 (i86g). HoBK. Synops. 144 (1873). Lesq. James Moss. N. Amer. 303 (1884). 



Leskea subenervis Schwaeq. Suppl. I, P. II, 176, t. 85 (1816). Funck Moost. 55, t. 36 

 (1821). Brid. Bry. univ. ii, 307. Hueben. Muse. Germ. 586 (1833). De Not. Spicil. 

 9 (1837), Syllab. 67 (1838). 



Neckera pulvinata C. Muell. Synops. ii, 83 (1850). 



Myrinia pulvinata Schimp. Synops. 483 (i860), 2 ed. 589. Berk. Handb. 146 (1863). 

 HOBK. Synops. 2 ed. 188 (1884). Boulay Muse. Fr. 172 (1884). HosN. Muse. Gall, 299, 

 t. 83 (1892). Dix. James. Stud. Handb. 368 (1896). Limpr. in Rabenh. D. kr. fl. Laubm. 

 ii. 743. fig- 341 (1895). 



Helicodont'mm pulvinatum Lindb. Musci Seand. 37 (1879). 



Autoicous ; in dense very soft, dark green tufts, often dirty brown at 

 base. Stem creeping, irregularly branched, the branches short, curved, 

 erect. Leaves spreading, appressed when dry, ovate or ovato-lanceolate, 

 concave, entire, obliquely and obtusely pointed, nerve thin, J length of 

 leaf; cells lax, incrassate, smooth, chlorophyllose, longish-oval, at base 

 rhombic, and quadrate at basal margin. Perichaetial bracts sheathing, 

 convolute, long, linear-lancolate, acute, nerveless, seta reddish ; capsule 

 erect, cylindraceous, with a short neck, brown, contracted below mouth, 

 lid conic, rather obtuse ; peristome of 16 teeth, united at base, lineal- 

 lanceolate, endostome a narrow yellow membrane, processes 16, long as 

 teeth, like those of Isotheciuin viviparum ; narrow lineal, keeled, often 

 imperfect, cilia none. 



Hab. — Wet ground by streams, roots and stems of trees, not common. 

 Fr. 6-7. 



