Analytic Keys to the Species of Mosses. 
75 
In loose tufts, plants small, bright green, dioicous H. birentrosum, 40 K 
In dense hemispherical bright green tufts, monoicous H. collinum, 43. 
* *• Leaves acute or acuminate, entire. 
Capsule strongly constricted under mouth when dry. 
Leaves widest just at base, tapering equally. 
Deeply plicate, cells obscure.H. nitens, 33. 
Concave, smooth, cells plain . . . . H. polygamum, 132. 
Leaves widest above base, long-acuminate . H. clirysopliylluni, 130. 
Leaves widest above base, not acuminate H. palustre, 165. 
Capsule slightly or not constricted. 
Plants reddish-brown below, orange above H. badium, 183. 
Plants whitish-,yellowish- or bright green. 
Cilia 0, basal cells quadrate, numerous H. Domicilii, 42. 
Cilia 2. 
Monoicous, leaves open.H. salebrosum, 37. 
Dioicous, leaves appressed-imbricate ... II. albicans, 39. 
Cilia solitary. 
Alar cells loosely quadrate, thin . . . H. oxycladon, 53a. 
Alar cells round-quadrate, obscure. . . . H. apocladum, 68. 
* * * Leaves obtuse {sometimes apiculate in 175) entire. 
Cells not enlarged at basal angles. 
Leaves open.H. arcticum, 168. 
Leaves closely imbricate ;.H. trifarium, 181. 
Cells enlarged at basal angles. 
Costa subpereurrent. 
Monoicous, sparingly branched, alar cells gradually 
enlarged. H. cordifolium, 173. 
Dioicous, profusely branched. 
5—10 cm. long, variegated or dark purple, stolons 
green. H. sarmentosnm, 175. 
15— 30 cm. long, bright- to yellowish green . II. giganteum, 174. 
Costa reaching middle. 
Branches irregularly pinnate, leaves spreading . H. Richardsoni, 177. 
Branches few, leaves imbricate . . . H. strainineum, 180. 
1 The sterile H. (Brachytheciura) Fitzgeraldi, Muller ( Flora , 1887, 224), is related to this 
species and distinguished from it “by its parallel julaceous-terete branches and larger, 
broader and less acuminate leaves.'’ 1 
