94 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



2,^. Leaves strongly transversely undulate Rhytidium, p. i6o 



Leaves not transversely undulate 38 



38. ParaphylHa numerous Cratoneuron, p. 159 



Paraphyllia lacking Drepanocladus, p. 167 



39. Capsule oblong-ovoid; stem leaves much larger than 



branch leaves Brachythecium, p. 143 



Capsule oblong-cylindrical; leaves mostly uniform in size 40 



40. Stem densely' tomentose, erect; leaves glossy 



Camptothecium, p. 142 

 Stem not densely tomentose; leaves rarely glossy 41 



41. Stem prostrate and irregularly branched; rhizoids mostly 



numerous Amblystegium, p. 155 



Stem prostrate or ascending; rhizoids few 



Chrysohypnum, p. 158 



42. Leaves complanate 43 



Leaves not complanate 44 



43. Leaves decurrent; basal areolation lax, alar cells often 



more or less enlarged Plagiothecium, p. 152 



Leaves not at all or very slightly decurrent; basal cells 

 scarcely differentiated Isopterygium, p. 151 



44. Operculum long-rostrate Sematophyllum, p. 150 



Operculum conical to short-rostrate 45 



45. Leaves obtuse or apiculate, rarely acute 46 



Leaves acuminate 48 



46. Leaves usually more or less secund, gradually narrowed 



above to an obtuse or rarely acute apex; mosses growing 



on dripping or wet rocks Hygrohypnum, p. 169 



Leaves imbricated or spreading, with a broad rounded apex 47 



47. Mosses growing in swamps; stem with an outer layer of 



large hyaline cells Acrocladium, p. 167 



Mosses growing in dry woods; stem bright red, cortical 

 cells small Hypnum, p. 166 



48. Leaves secund, falcate or circinate 49 



Leaves mostly spreading 51 



49. A large moss (8-20 cm.), very regularly pinnate, frondi- 



form; leaves multiplicate, smooth; paraphyllia numerous 



Ptilium, p. 162 

 Medium-sized mosses (i-io cm.), irregularly pinnate; 

 leaves scarcely or not at all plicate; paraphyllia few or 

 none 50 



50. Leaves sharply serrate, papillose Ctenidium, p. 161 



Leaves entire or serrulate, smooth Stereodon, p. 162 



