EXTODONTACEAE. 495 



the middle of the leaf; apex acute; upper cells rhomboidal ; alar cells rectan- 

 gular anl oblique, only reaching the vein and more numerous on one side of 

 the base; basal radiating and longer, all minutely and distinctly papillose on 

 the back; perichaetial leaves smaller, erect, clasping, more suddenly acuminate. 

 Autoieous; pedicel up to 1 cm. long; calyptra small, entire; capsule horizontal, 

 slightly unequal, 1.5-2 mm. long, its walls with swollen cells; lid large and 

 pale, conic, short-beaked; annulus none, mouth with a dark rim; peristome 

 double, the teeth yellow, paler and papillose at apex, inner with white, perforate 

 keeled segments and shorter slender cilia; spores small and smooth, ripe in 

 winter. 



On logs and rotten wood, in coppices, New Providence, Abaco, Great Bahama 

 and Lignum Vitae Cay : Florida ; New Mexico ; Texas ; Cuba ; South America. 



Family 12. LESKEACEAE Reichb. 



Leskea Family. 



Plants small or large. Stems creeping and branching, either irregularly 

 or pinnately; branches short, usually slender and crowded with small 

 leaves; vein single; cells papillose on one or both surfaces; branch-leaves 

 smaller than the stem-leaves; rudimentary leaves present. Pedicel erect 

 or inclined; calyptra cucullate; annulus often present; capsule erect or 

 horizontal, usually symmetric, its lid conic or beaked ; peristome double, the 

 inner sometimes shorter and imperfect. About 23 genera, containing some 

 333 species, widely distributed. 



1. HAPLOCLADIUM C. Muell. Xuov. Giorn. Bot. Ital. 3: 11. 1896. 



Branches slender, simple, not pinnately divided; leaves papillose only on 

 the back, those at base of pedicel erect, longer and paler. [Greek, referring to 

 the simple branches.] A genus of 43 species, natives of America and eastern 

 Asia. Type species: Haplocladium macropilum C. Muell. 



1. Haplocladium microphyllum (Sw.) Broth, in E. & P. Nat. Pflf. 229: 1007. 



1907. 



Ilypnum microphyllum Sw. Prodr. 1-42. 1788. 



Plants dark green or yellow. Stems creeping and rooting, sometimes quite 

 slender and branching irregularly; branches short and simple, erect; leaves 

 crowded, spreading or secund, ovate, acuminate, small, up to 0.5 mm. long, 

 those of the branches smaller and less acuminate than those of the stem; vein 

 excurrent into a long tip; margins minutely toothed; cells small, square or 

 oblong, papillose only on the back ; leaves at base of pedicel longer and paler, 

 erect. Pedicel 2-2.5 cm. long, slender, erect; capsule 1 mm. long, horizontal 

 and curved; annulus falling with the conic lid; peristome double, the inner 

 with keeled segments and 3 cilia; spores smooth, maturing in summer. 



On rocks in coppices. New Providence and Great Exuma : Florida ; Bermuda; 

 Cuba: Jamaica; Porto Rico; Mexico and South America. S.m m.i. I i: LVBD Haplo- 

 cladium. 



