<62 
Wisconsin Academy of Sciences , Arts and Letters. 
Aristate at apex. 
Awn colored, short. 
Leaves spreading when moist, subrecurved . P. juniperinum, 4. 
Leaves erect-open, strict . P. strictum, 5. 
Awn hyaline, long . P. piliferum, 3. 
Leaves serrate. 
Marginal cells of lamellae like rest, oval, higher than > 
broad in section. * 
Capsule ovate, obscurely angled, lid rostrate . . P. gracile, 1. 
Capsule oblong, 4-6 angled, lid acutely conic . P. formosnm, 2. 
Marginal cells of lamellae enlarged, broader than high 
( 3: 1).P. Ohioense. 1 2 
Marginal cells of lamellae semilunar, with two promi¬ 
nent papillae at corners.P. commune, 6. 
FONTINALIS, p. 268. 
I. Perichcetial leaves abruptly pointed, entire/ 1 
Leaves decurrent, teeth not lacunose . . . F. Neo-Mexicana, 3. 
Leaves not decurrent, teeth lacunose . . . F. Dalecarlica, 4. 
II. Perichcetial leaves rounded-obtuse, entire or lacerate. 
A. Leaves of branches unlike stem leaves F. Howellii. 3 4 
B. Leaves homomorphous/ 
1. Leaf-cells long-linear (1:10 +). 
Alar cells very large. 
Leaves acute. F. Sullivantii, 8. 
Leaves with very apex blunt or denticulate . . . F. flaccida. 5 
1 Renauld & Cardot: Revue BryoL 1885, 11; also Bot. Gaz., xiii, (1888), 199, pi. XVII. 
2 The fruit of F. Californica and F. flaccida has not yet been found. The latter will 
possibly fall here. Muller has also described imperfectly a sterile species, F. maritima , 
from Neah Bay, Wash. It is distinguished at once, he says, by the rigid branches and 
-deeply carinate-canaliculate leaves. Having seen neither specimens nor figures I am un¬ 
able to place it properly in the key. 
3 Renauld & Cardot: Bot. Gaz., xiii (1888), 200, pi. XVIII. 
4 In F. biformis the summer leaves are unlike the vernal, so that specimens collected 
just as the vernal are falling might deceive. 
5 Renauld & Cardot: 1. c., p. 201, pi. XIX. 
