ANALYTIC KEY 



TO THE 



GENERA OF MOSSES. 



Order I. — Sphagnales. 

 Capsule dehiscing by a deciduous operculum, peristome 

 none, leaves composed of large hyaline cells, with 

 intervening rows of small chlorophyllose ones. 

 Grenus single Sphagnum, 12. 170. 



Order II. — Andreaeales. 

 Capsule dehiscing by four (rarely six) longitudinal slits. 



Genus single Andreaea, 25. 175. 



Order III. — Archidiales. 

 Capsule bursting irregularly, spores few and very large. 



Genus single Archidiura, 49. 176. 



Order IV. — Bryales. 



Capsule bursting irregularly (spores numerous) or gen- 

 erally dehiscing by a deciduous operculum, in the 

 latter case usually furnished with a peristome. 

 Leaves not sphagnoid. 

 Genera numerous as follows: 



I. CLEISTOCARPI.— Capsule ivithout a deciduous ojierculum. 



(II on p. 158.) 



A. Green protonema persistent. (B on p. 158.) 

 Leaves ecostate. 



Capsule colorless Micromitrium, .37. 176. 



Capsule colored Ephemeruin, 37. 1 76. 



Leaves costate Ephemerum, 37. 176. 



