WILLIAMS: Two NEW WESTERN Mosses 6T 
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 2.5x 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 .o4 x .005 mm., alar cells mostly 
about .o12x.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 1 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- 
Tow, 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 .o25 mm. long ; spores (immature) smooth, .o15 mm. 
This plant with its short-pointed, scarcely plicate and secund 
leaves with vein sometimes forking, has much the appearance of a 
Limnobium (Hygrohypnum), but the seta rough above and the 
highly conical lid seem to relate it most closely to Brachythecium, 
Which also contains all the first-mentioned characters. Collected 
oy © G Pringle in the Huachuca Mts., Arizona, July, 1884 (22). 
Explanaion of Plates 
Drawings made with a magnification twice the diameter reproduced on the plates. 
PLATE 4 
Fic, 1, Plant, natural size. 
Fic. 2, Stem leaf, I. 
EGS. 3 4, 5. Lower, middle and upper branch leaf, 15. 
1G. 6. Alar region of stem leaf, X 120. 
