67 Williams : Two new Western Mosses 



Collected by J. B. Leiberg on decaying logs in streams, April, 

 1889, Traille River Basin, Idaho (172). Named for the artist who 

 has made the excellent drawing which accompanies this descrip- 

 tion, Miss Alexandrina Taylor. 



Brachythecium Pringlei 



Monoicous ; $ flowers abundant on fruiting stems. Growing 

 in compact tufts with ascending, more or less branching stems 4 

 —5 cm. long and 0.25 mm. in diameter; cross sections of stem 

 show a distinct central strand and 3 or 4 rows of thick-walled 

 outer cells ; branches mostly short, rather irregular, with curved 

 tips; stems and branch leaves very similar, up to 2.5 x 1.5 mm., 

 secund, mostly broadly ovate with short acute point, long decur- 

 rent, concave, scarcely or not plicate, borders flat, entire or slightly 

 serrulate above ; leaf-cells somewhat thickened and near base, 

 pitted ; median cells linear, about .04 x .005 mm., alar cells mostly 

 about . 012 X. 016 mm., often forming a distinct convex cluster 

 packed with chlorophyll ; inner perichaetial leaves erect, grad- 

 ually lanceolate-pointed, the point somewhat variable in width, 

 nearly entire and ecostate ; seta distinctly papillose in upper part, 

 about I cm. high ; capsules (not quite mature in only specimens 

 seen) ovate-oblong, not quite symmetrical, nearly erect, with lid 

 2.5 mm. long; lid highly conical, .8 mm. high; annulus nar- 

 row, of I or 2 rows of cells ; teeth about .430 mm. high and 

 .065 mm. wide at base, rather broadly and irregularly pointed, 

 hyaline bordered, rather irregularly striate and somewhat papillose 

 below, and distinctly papillose above ; basilar membrane of en- 

 dostome extending about two fifth up, segments more or less split, 

 cilia mostly 2 and not appendiculate ; stomata slightly elongated, 

 about .025 mm. long; spores (immature) smooth, .015 mm. 



This plant with its short-pointed, scarcely plicate and secund 

 leaves with vein sometimes forking, has much the appearance of a 

 Linuiobiiim [Hygroliypmuii), but the seta rough above and the 

 highly conical lid seem to relate it most closely to BracJiytlicciimi, 

 which also contains all the first-mentioned characters. Collected 

 by C. G. Pringle in the Huachuca Mts., Arizona, July, 1884 (22). 



Explaiia>.ioii of Plates 



Drawings made with a magnification twice the diameter reproduced on the plates. 



Plate 4 

 Fig. I. Plant, natural size. 

 Fig. 2. Stem leaf, X I5- 



Figs. 3, 4, 5. Lower, middle and upper branch leaf, X ^S- 

 Fig. 6. Alar region of stem leaf, X l-^o. 



