No. II.] THE BRYOPHYTES OF CONNECTICUT. 93 



23. Capsule symmetrical, erect or nearly so; inner peristome 



without cilia 24 



Capsule unsymmetrical, more or less inclined and curved; 

 inner peristome arising from a broad basal membrane; 

 cilia well developed 29 



24. Branches strongly complanate; leaves cultriform 



Homalia, p. 132 

 Branches terete or somewhat flattened; leaves ovate to 

 lanceolate 25 



25. Segments either partially or wholly lining the teeth, basal 



' membrane lacking or obscure 26 



Segments entirely free from the teeth 2^ 



26. Leaves with a midrib; stalk rough. .. .Homalothecium, p. 134 

 Leaves without a midrib; stalk smooth Pylaisia, p. 133 



27. Basal membrane broad and distinct 



Pylaisia subdenticulata, p. 134 

 Basal membrane very narrow, or lacking 28 



28. Stem oval in cross-section; capsule 3-4 mm. long 



Entodon, p. 132 

 Stem round in cross-section; capsule 1.5-2.5 mm. long; an- 

 nulus several cells broad Platygyrium, p. 132 



29. Midrib single 30 



Midrib double or furcate, frequently short or lacking 42 



30. Lid more or less long-rostrate 31 



Lid conical to short-rostrate ZZ 



31. Leaves spreading or imbricated 32 



Leaves complanate Rhynchostegium, p. 150 



32. Leaves very concave, spoon-shaped, abruptly filiform- 



acuminate Cirriphyllum, p. 147 



Leaves plane or slightly concave, acute or gradually 



acuminate Eurynchium, p. 148 



Z'i- Leaves obtuse, apiculate, or acute 34 



Leaves acuminate 36 



34. Large mosses (6-20 cm.), growing in swamps; stem leaves 



2-3.5 "^iTi- long, spreading or imbricated. . .Calliergon, p. 166 

 Medium-sized mosses (3-8 cm.), growing on rocks and 

 earth in or along streams; leaves 0.6-1.6 mm. long, 

 frequently secund 35 



35. Midrib strong, disappearing abruptly just below apex of 



leaf Amblystegium fluviatile, p. 157 



Midrib faint, vanishing near middle of leaf, frequently 



forked Hygrohypnum, p. 169 



36. Leaves secund Z7 



Leaves equally spreading 39 



