48 
Wisconsin Academy of Sciences , Arts and Letters. 
Capsule immersed or emergent. 
Leaves densely papillose.0. Sturmii, 4, 
Leaves almost smooth . . . . . . 0. bullatum, b 
2. Peristome double. 
[OO. laevigatum and Sturmii, may be sought here.] 
a. Capsule entirely smooth. 
Immersed, papillae simple.0. leiocarpum, 25, 
Exserted, papillae bifurcate.0. Kingianum, 15, 
b. Capsule strongly costate. 
Leaves beset with clavate gemmae.0. Lyellii, 83. 
Leaves not gemmiferous. 
Teeth erect when dry, cilia 16 . . . 0. Texanum, 5, 
Teeth reflexed when dry (O. brachytrichum ?), cilia 8. 
Capsule (inch collum) subcylindric. 
Leaves acute, papillae simple or bifurcate, salient . 0. affine, 10, 
Leaves apiculate, minutely papillose . . 0. brachytriclmin, 18. 
Capsule obovate.0. sordidum, 14, 
c. Capsule ribbed only near mouth. 
Peristome opaque, very papillose, reflexed when dry 0. speciosuni, 12, 
Peristome opaque, transversely lineolate, reflexed when 
dry.0. Bolanderi, 8.^ 
Peristome not opaque, erect when dry, papillae more or 
less obliterated or reduced to sinuous lines . . 0. rupestre, 7, 
B. Stomata immersed. 
s. I 
1. Peristome simple. 
Capsule smooth when dry.0. Douglasii, 6. & 
Capsule faintly costate, bands (8, rarely 16) cinnamon-red 0. anomalum, 1. 
Capsule 16-costate, bands (16, rarely 8) yellow . . 0. cupulatum, 3. 
Capsule 8-costate.0. Texanum, 5. i * 3 
[O. Hallii may be sought here.] 
i Muller: Flora , 1887, 223. 
3 This sp. is O. rupestre , var. vulgare, forma densior according to Venturi in Husn. Muse . 
Gall. 156. 
3 This species is repeated here because the character of the stomata is unknown to me. 
