Analytic Keys to the Species of Mosses. 
77 
b. Alar cells scarcely different or quadrate, not abruptly enlarged. 
1. Leaves thin, glossy, open; plants mostly small, prostrate or with as¬ 
cending branches. 
* Leaves complanate. 
Lid rostrate. 
Leaves transversely undulate, serrulate at apex . H. imdulatiun, 110. 
Leaves not undulate, quite entire H. sylvatieuin, 109. 
Leaves not undulate, serrulate to base. 
Bicostate, annulus large ..... H. geopliiliun, 87. 
Uni- or ecostate, annulus 0.H. deplanatum, 88. 
Lid convex or conic. 
Uapsule pendent.H. elegans, 105. 
■Capsule suberect, inclined or horizontal. 
Sulcate and constricted below mouth when dry . H. turfaceum, 104. 
Smooth when dry. 
Autoicous, plants growing on rotten wood. 
Annulus 0.H. mica us, 103. 
Annulus large, triple .... H. demticnlatum, 106. 
Dioicous, plants growing on stones or the ground. 
Leaves quite entire, capsule obovate, campanulate 
when dry.H Muelleriaimm, 107. 
Leaves serrulate, capsule subcylindric . H. Sullivantlse, 108. 
* * Leaves equally spreading. 
Capsule suberect, smooth ivhen dry. 
Dioicous, cilia 0, costa obsolete. 
Inner perichaetial leaves ovate lanceolate . . H. latebricola, 98. 
Inner perichaetial abruptly acuminate . . H. Passaicense, 99. 
Autoicous, cilia 2—3, costa double. 
Thick, ascending to middle.H. geiiiiniiin, 102. 
Thin, reaching half way to middle . H. deiiticulatiim, var. 106. 
Capside inclined , sulcate ivhen dry . EL pseiiclo-Silesiacnni, 113. 
Capside inclined or horizontal, often arcuate, smooth ivhen clry. 
Leaves squarrose, abruptly long acuminate . H. Mspidulum, 129. 
Leaves loosely imbricate, obtuse or acute, alar cells orange. 
Nearly as broad as long, obtuse or apiculate . . H. molle, 166. 
Nearly twice as dong as broad, acute, point often half 
twisted. IL alpestre, 167. 
Leaves falcate, gradually acute .... H. montanum, 170. 
