No. II.] THE BRYOPHYTES OF CONNECTICUT. 89 



20. Midrib with 2 median guides, upper band of stereid cells 



lacking Tortula, p. 109 



Midrib with several (4-8) median guides and 2 bands 



of stereid cells 2i 



21. Leaf margins revolute, at least below the middle 



Barbula, p. to8 



Leaf margins plane, not revolute Tortella, p. 107 



22. Calyptra mitrate 23 



Calyptra cucullate 27 



23. Calyptra plicate 24 



Calyptra not plicate 25 



24. Calyptra smooth; teeth distantly articulate 



Glyphomitrium, p. no 



Calyptra hairy; teeth closely articulate. . .Orthotrichum, p. 113 



25. Beak long, clavate Encaljrpta ciliata, p. no 



Beak apiculate to aciculate 26 



26. Teeth narrowly cleft nearly to the base. .Racomitrium, p. 112 

 Teeth subentire, cribrose or irregularly cleft. .Grimmia, p. iii 



27. Teeth of peristome arising from a distinct basal membrane 28 

 Teeth of peristome not arising from a basal membrane. ... 31 



28. Teeth short; leaves papillose on upper surface 



Didsmiodon, p. 108 



Teeth long; leaves mostly smooth 29 



29. Capsule inclined, distinctly plicate when dry; leaf cells 



roundish quadrate above Ceratodon, p. 97 



Capsule erect, smooth or slightly plicate when dry; leaf 



cells more or less elongated above 30 



30. Leaves glaucous Saelania, p. 97 



Leaves bright or dark green, glossy Ditrichum, p. 96 



31. Plants growing on trees Drummondia, p. 113 



Plants growing on earth or rocks 32 



32. Leaf margins strongly involute above, entire. . .Weisia, p. 106 

 Leaf margins plane, minutely crenulate. .Trichostomum, p. 107 



33. Inner peristome without a basal membrane 34 



Inner peristome with a distinct carinate basal membrane. . 37 



34. Calyptra cucullate Funaria, p. i \^ 



Calyptra mitrate 35 



35. Calyptra not plicate, smooth, entirely enclosing and 



extending below the base of the capsule 



Encalypta contorta, p. 1 10 

 Calyptra plicate, usually hairy and partially enclosing the 



capsule 36 



