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Wisconsin Academy of Sciences , Arts and Letters . 
II. Collum present. 
A. Equalling sporangium. 
Spores papillose.B. Bolanderi, 4. 
Spores pitted.B. brevifolia, 12. 
B. Shorter than sporangium. 
1. Calyptra papillose. 
Leaves denticulate at apex.B. Ravenelii, 13. 
Leaves denticulate all around.B. Hampeana, 14. 
2. Calyptra smooth. 
a. Leaves papillose B. Donnellii, 9. 
1). Leaves smooth (subpapillose in B. Sullivantii.) 
• i. Costa not filling the narrowed point. 
Synoicous.B. flexnosa, 2. 
Monoicous.B. Sullivantii, 3. 
ii. Costa broad above, filling point. 
Capsule immersed. B. brevipes, 11. 
Capsule exserted. 
Leaves appressed.B. Hallii, 8. 
Leaves spreading. 
Seta straight. 
Collum more than ■§■ spore case .... B. Texana, 10. 
Collum less than \ spore case B. brevicollis, 6. 
Seta geniculate at middle.B. curviseta, 7. 
ARCHIDIUM, p. 49. 
Autoicous. 
Costa reaching to point of leaf 
. . A. Oliioense, 1. 
Costa often long excurrent .... 
A. Hallii, 5. 
Paroicous. 
Leaves serrulate. 
A. tenerrimum, 2. 
Leaves quite entire. 
Cells oval or rhombic. 
A. Ravenelii, 3. 
Cells quadrangular or quadrate . 
A. longifolium, 4. 
