Williams: Mosses from west coast of South America 39o 



the single row of large cells bearing about 20 rows of filaments 

 3-5 cells high with the terminal cell often contracted into a 

 mamillate apex; basal cells of leaf pale, short-rectangular to 

 square, up to 20 n wide and about 25 n long, with walls slightly 

 thickened at the angles, the cells about one half up the leaf becom- 

 ing more or less transversely elongate, especially toward the 

 margin, with unequally thickened, not pitted, walls; outer peri- 

 chaetial leaves not differentiated, the i or 2 inner leaves very 

 small, pale, narrowly lanceolate, nearly ecostate; seta reddish, 8-9 

 mm. high; capsule ovate-oblong, nearly symmetric and erect, 

 2 mm. long with the lid; lid conic, about as high as its basal 

 diameter; peristome papillose, very irregular, from a low basal 

 membrane, the teeth varying from long-lanceolate to little more 

 than lobes scarcely projecting above the annulus; annulus per- 

 sistent, of a single row of large cells; calyptra cucuUate, smooth, 

 extending about half way down the capsule; spores slightly 

 rough, up to 24 fjL in diameter. 



Peru: vicinity of Lima, July, iSsQS (type); Posco, August, 

 18813a. 



Crossidium Rosei sp. nov. 



Autoicous, the male flowers at the apex of the branches, the 

 inner perigonial leaves smaller than the outer, otherwise scarcely 

 differentiated, the 6 to 8 antheridia about 0.25 mm. long, with rather 

 numerous, often longer, filiform paraphyses: plants in rather 

 compact mats, the short stems, with radicles at base, bearing 

 several short branches crowded together bud-like, and 2-3 mm. 

 high ; leaves when dry appressed-incurved, often somewhat crispate, 

 when moist, erect-spreading, ovate-oblong to oblong-spatulate, 

 2-2.5 mm. long, in the upper third finely papillose on both sides, 

 the margins entire and flat or more or less recurved; costa slightly 

 excurrent, enlarged in the upper half, in cross-section showing a 

 large stereid band on the under side and on the upper side some 6-8 

 large cells, mostly in one row, bearing numerous, short, somewhat 

 club-shaped filaments 2 or 3 cells high with the terminal cell 

 papillose; leaf cells distinct throughout, the basal pale green, 

 nearly square to short-rectangular, up to 20 ^t wide by about 35 n 

 long, the median cells scarcely elongate, about 16 X 16 m, with 

 walls scarcely thickened; perichaetial leaves hardly differentiated, 

 the inner usually smaller; seta rather flexuous, about 8 mm. long; 

 capsule erect, nearly symmetric, oblong, about 1.5 mm. long with 

 the lid; lid conic, acute, a little higher than its basal diameter, the 

 cells, except at the base, elongate in oblique rows; peristome a 

 papillose basal membrane extending 3 or 4 rows of cells above the 

 persistent annulus, its margin more or less incised and bearing 



