MOSSES IN THE VICINITY OF CLEVELAND. 



69 



The genus Hypnum is a member of the natural order 

 Hypnacia?, and is characterized by its lateral fruit — i. e., 

 growing from the side of the stem or branches — its smooth 

 cuculiform calyptra, and its more or less nodding capsule. 

 The capsule is unequal^ being more convex on its upper 

 side, thereby causing the mouth to be somewhat oblique. 

 The peristome is double ; the outer is composed of sixteen 

 lanceolate reiiexible teeth, the inner is a keeled membrane, 

 the keels or ridges of which form sixteen processes, occu- 

 pying the space between the outer teeth, and are connected 

 with each other by this membrane, which forms inter- 

 vening cilioke more or less capilliary. The operculum or 

 lid varies in form in different species from long beaked to 

 hemispherical, constituting a valuable specific character- 

 istic. The form of the cuculate calyptra corresponds with 

 the operculum. The antheridia, or sterile flowers, are 

 always axilliary and generally in pairs. 



HYPNUM SYLVATICUM. 



This plant grows in loose bright green mats, attached to 

 grassy spots in swampy and springy localities, with flat. 



