Parr 2, 1913] DICRANACEAE 117 
usually a single row of stomata about the base of the spore-sac; annulus obscure, mostly of 
two rows of pale cells adhering to the capsule; lid obliquely rostrate, about two thirds the 
length of the capsule; peristome-teeth from a low basilar membrane, 70 uw wide at the base, 
divided about one half down: calyptra densely papillose one half down or more: spores nearly 
smooth, up to 16 u» in diameter. 
‘TvPE Locality: Europe. 
DISTRIBUTION: Oregon to the Yukon River; also in Europe. Credited to eastern North 
America, but no specimens from the East have been seen, 
ILLUSTRATION: Hedw. Sp. Musc. pl. 32. 
5. Dicranum hispidulum R. S. Williams, Bull. N. V. Bot. 
Gard. 2: 353. 1902. 
Autoicous: perigonium close under the perichaetium: plants in compact, rather yellowish- 
green tufts; stems usually without radicles and with few branches, up to 2.5 cm. high, in 
cross-section nearly circular, 180 » in diameter, with a distinct central strand and outer cells 
with but slightly thickened walls: leaves spreading all round, incurved-flexuous, rough on the 
back and margins above with crowded, mamillate papillae, the upper stem-leaves scarcely 2 
mm. long, in cross-section showing no stereid-band nor distinct gutide-cells, the cells of the 
blade on either side of the costa near the middle of the leaf often doubled for 5 or 6 rows out- 
ward; costa excurrent, usually 40-50 » wide at the base and slightly broader above: leaf-cells 
slightly elongate, the wpper ones rather irregular, the median about 10 » wide and 10-20 p long, 
the alar forming a distinct group of somewhat enlarged, nearly square or inflated colored cells; 
cell-walls not pitted nor distinctly thickened: capsule oval, slightly curved before opening, 
and slightly strumose, 1.5 mm. long without lid; lid obliquely rostrate, about 0.75 mm. high; 
exothecal cells rectangular, 2-4 times as long as broad; annulus well developed, 2—3 rows of cells 
high; peristome-teeth split to below the middle: spores smoothish, up to 124 in diameter. 
‘TYPE LocaLITy: Macdonald lake, Great Northern Railway, Montana. 
DisTRIBUTION: Known only from the type locality. 
ILLUSTRATION: Bull. N. Y. Bot. Gard. 2: pl. 34. 
This plant should perhaps be considered as only the small, xerophytic form of D. Schisti, just 
as D. Starkii may be regarded as the larger, best developed form of the same species. -—~—~ 
6. Dicranum Schisti (Gunn.) Lindb. Acta Soc. Sci. 
Fenn. 10: 11. 1871. 
Bryum Schisti Gunn. Fl. Norv. 2: 138. 1772. 
Dicranum Blyttii B.S. G. Bryol. Eur. (37-40:) Dicranum 26. 1847. 
Dicranoweisia obliqua Kindb. Ottawa Nat. 5: 195. 1892. 
Cynodontium Treleasei Card. & Thér. Proc. Wash. Acad. Sci. 4: 295. 1902. 
Autoicous: male flower on the stem well below the perichaetium, or on a short branch: 
plants in compact green tufts, dark-brown within; stems up to 3 cm. high, more or less branch- 
ing, without radicles above, the leaves spreading-flexuous all round: upper stem-leaves about 
4 mm. long, lanceolate-attenuate, concave, the margins slightly crenate, the point rough with 
low papillae; costa more or less excurrent, about 50 « wide at the base, in cross-section showing 
cell-walls of uniform thickness, the median row larger with mostly one row above and two below 
of smaller cells; leaf-cells with slightly thickened, usually not pitted walls, the upper about 6 u 
wide and from square to 2-3 times as long as broad, the lower up to 60 uw long; alar cells indis- 
tinct or forming a rather irregular, reddish, often inflated group; inner perichaetial leaves about 
the length of the stem-leaves with a convolute base extending about one half up and gradually 
narrowed to the papillose point: seta reddish when old, up to 14 mm. long: capsule about 1.5 
mm. long, ovate, nodding, slightly curved, often strumose, nearly or quite smooth when dry; 
exothecal cells with thin, somewhat sinuous walls, the median about 25 » by 60 4; stomata in 
mostly 2 rows in the short neck; annulus broad, distinct, of 2 or 3 rows of cells; lid conic, 
with an obliquely rostrate beak half as long as the capsule; peristome-teeth 75 u wide at base, 
reddish, from a low basilar membrane, divided two thirds down, more or less perforate below: 
calyptra slightly papillose at the apex: spores minutely roughened, up to 16 » in diameter, 
Typr LOCALITY: Norway. ; 
DIsTRIBUTION: New Hampshire and New York; Washington, Idaho, and northward to the 
Yukon region; also in Europe. 
ILLUSTRATION: B.S.G. Bryol. Eur. pl. 63. 
