— 180 — 
few specimens together with Ditrichum pallidum and Pleuridium — 
palustre: Breidler»: Limpricht Laubm. Deutechl. LG 
^B. Leaves entire abruptly narrowed from ovate base. 
6.D.subulatum Bruch. — Leptotrichum Bruch; Ditrichum Lindb. 
Leaves otherwise as in D. pallidum. Capsule smaller, suboval - 
faintly suleate; annulus none; pedicel not long. — Clayey places | 
on rocks r. Eur. southern districts. France: Philibert. Italy: - : 
Bottini; Arcangeli. i5 ee 
2. Erythropodia. 5 
A. "Tufts very tomentose, us. high and glossy. Leaves 
gen. large; alar cells sometimes distinct subquadrate; costa long- 
excurrent. o 
7.D.flexicaule Schleicher. — Didymodon Schl.: Ditrichum Hampe 
Leaves long-subulate often denticulate, not appressed; cells | 
irregular gen. narrow: basal shorter often reddish; costa often 
broad. Capsule brown. R. fruiting. — Rocks and stony ground, — 
common. Eur. Sweden, Norway, Switzerl.! Austria, fruit: Ven- 
turi. Amer. Can.: Drummond; Macoun. t 
* D.densum (Schimper as var. Kindb. m 
Leaves shorter and less patent; cells gen. short, upper suboval. — 
‘Tufts more dense and less glossy. — Eur. princ. in northern — 
districts. Sweden common, often fruiting!; M. Huss. Amer. - 
Can.: Macoun. m 
B. Tufts not or sparingly radiculose, us. low and not glossy. — — 
Leaves gen. not large; alar cells not distinct. ides 
a: Leaf-cells gen. narrow, rectangular. de e 
: = Perichetial leaves sheathing. Peristome without basal - 
ube. oe 
5.D.vaginans Sullivant. — Trichostomum Sull. ie. m.; Ditri- 
chum Hampe. jail: 
Leaves from ovate base gradually short-subulate or acute, 
entire or nearly so, appressed when dry, erect when moist; 
cells narrow; costa percurrent or short-excurrent ^ Tufts eradi- 
culose not glossy, 1 or r. 9 c. m. high. — Earth and wet 
rocks r. Eur. Norway: Geheeb, com. €. Mueller. Belgium: 
Gravet. France: Lamy, com. Husnot. Amer. Can.: Macoun. 
9.D.homomallum Hedwig. — Didymodon Hedw.; Ditrichum 
Hampe. fae 
Leaves (at least on fruiting stem) long subulate gen. entire, 
us patent; cells gen. narrow; costa (at least on leaves of fruit 
stem) long-excurrent. Tufts us. low. Sterile shoots often 
short-subulate with subpercurrent. costa, -— Sandy ground prine. 
