TORTULACEAE. 485 



are ripe. [The name refers to this character.] A small genus of 45 species 

 widely distributed in temperate and tropical regions. Type species: Gymnc- 

 stomum microstomum Hedw. 



1. Hymenostomum flavescens E. G. Britton, sp. nov. 



Plants usually light yellowish-green. Stems short, 3-5 mm. high; leaves 

 1.5-2 mm. long; apex lanceolate, incurved and cucullate, base broader and 

 hyaline ; margins inrolled, entire ; vein stout, rough above, ending in the mucro- 

 nate point; lower cells clear and smooth, up to 67 /a long; upper cells only 8 ft 

 long, densely papillose on both surfaces, with 34 small papillae. Dioicous. 

 Pedicel slender, 10-15 mm. long, erect; capsule ovoid-cylindric, 1-1.25 mm. 

 long with the beaked lid; calyptra cucullate, twisted; peristome and annulus 

 none, the mouth bordered by 5-6 rows of smaller, denser, quadrate cells; walls 

 thin; spores brown, papillose, ripe in winter. 



New Providence, Eleuthera, Andros, Great Bahama, Abaco and Acklin's Island. 

 Type from Finder's Point, Great Bahama, Britton and Millspaugh 2515. Feb., 1905. 

 BAHAMA HYMENOSTOMUM. 



4. HYOPHILA Brid. Bryol. Univ. 1: 760. 1826. 



Plants dark green, frequently sterile and propagating by brood-bodies 

 borne at the apex of the stems. Leaves linear-lanceolate or oblanceolate, not 

 very crowded; apex obtuse or acute, entire or with a few obscure teeth; vein 

 ending in or below the apex, rarely excurrent; basal cells clear, rectangular, 

 upper cells smaller and papillose, rarely smooth. Dioicous. Pedicel exserted, 

 slender ; capsule erect, narrow, cylindric ; mouth small ; annulus usually present ; 

 peristome none; lid beaked; calyptra cucullate. [Greek, referring to their 

 moisture-loving habit.] A genus of about 80 species, occurring in tropical 

 regions, widely distributed. Type species: HyopMla gymnostomoides Brid. 



1. Hyophila Tortula (Schwaegr.) Hampe, Bot. Zeit. 4: 267. 1846. 



Gymnostomum Tortula Schwaegr. Supp. 2 2 : 78. pi. 175. 1826. 

 Tortula Donnellii Austin, Bot. Gaz. 3: 31. 1878. 

 Barbula Donnellii Lesq. & James, Man. 128. 1884. 



Plants often growing on rocks in scattered, low cushions, usually sterile; 

 stems short and simple; leaves inrolled and twisted when dry, up to 2 mm. long 

 by 0.5 mm. broad, lanceolate; vein stout, brown, ending in the cuspidate apex, 

 smooth or slightly rough on the back ; basal cells smooth, oblong, upper cells in 

 transverse rows, hexagonal, mamillose on the inner surface, smooth on the back; 

 margins sometimes denticulate at apex. Dioicous. Only known sterile, in the 

 Bahamas, propagating by brood-bodies borne on filaments from the axils of the 

 upper leaves. [Pedicel 8-10 mm. long, erect; capsule 2 mm. long, cylindric; 

 mouth bordered by smaller, darker cells; annulus compound, falling with the 

 beaked lid; peristome none; calyptra cucullate and slightly twisted; spores 

 smooth, small.] 



New Providence and Abaco : Florida ; West Indies ; Mexico ; Guatemala and 

 South America. HYOPHILA. 



5. DESMATODON Brid. Mant. Muse. 86. 1819. 



Plants usually in cushions on limestone rocks or in crevices of walls. 

 Stems erect, usually short and simple or forking. Leaves crowded, incurved 

 and twisted when dry, spreading when moist, oblong-lanceolate; apex acute or 



