48 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [BuU. 



9. Leaves not complicate, usually expanded in one plane.... 10 

 Leaves distinctly complicate, the two portions meeting at 



a more or less distinct keel 22 



10. Leaves succubous ll 



Leaves incubous IQ 



11. Leaves bidentate or bilobed. 12 



Leaves with more than two teeth or lobes 18 



12. Underleaves distinct 13 



Underleaves none or very minute ^ 16 



13. Underleaves distinctly bifid 14 



Underleaves undivided or with a few marginal teeth or 



cilia 15 



14. Sporophyte enclosed within a perianth. .. .Lophocolea, p. 57 

 Sporophyte developed within a pendent perigynium 



Geocalyx, p. 59 



15. Growing on rotten logs, often gemmiparous 



Harpanthus, p. 59 



Growing on calcareous rocks, never gemmiparous 



Lophozia Muelleri, p. 53 



16. Perianth terete, more or less plicate at the mouth 



Lophozia, p. 52 



Perianth trigonous 17 



17. Leaf cells 0.025-0.05 mm. in diameter Cephalozia, p. 59 



Leaf cells 0.01-0.02 mm. in diameter Cephaloziella, p. 61 



18. Leaves undivided, margin sharply toothed. .Plagiochila, p. 56 

 Leaves with three or four broad teeth Lophozia, p. 52 



19. Leaves bidentate at the apex; ventral flagelliform branches 



none Calj^sogeia, p. 62 



Leaves mostly with three or four teeth, lobes, or divisions 20 



20. Stems apparently dichotomous; ventral flagelliform 



branches numerous Bazzania, p. 64 



Stems pinnately branched; ventral flagelliform branches 



none 21 



21. Divisions or lobes of leaves two or more cells wide, at 



least at the base; archegonia borne on short ventral 



branches Lepidozia, p. 65 



Divisions of leaves only one cell wide throughout; arche- 

 gonia borne on the main stem or on leading lateral 



branches Blepharostoma, p. 66 



22. Ventral lobe of leaf equaling or surpassing the dorsal in 



size '. 23 



Ventral lobe smaller than the dorsal 26 



