2i6 HOW TO KNOW THE MOSSES 



slender, the leaves more separated, and the ends of the 

 stems and branches are less strongly hooked. Floating 

 forms of Drepanocladus resemble certain fine species of 

 Fontinalis (p. 175), but are found in stagnant water, 

 while Fontinalis occurs in running water. The ends of 

 the stems and branches of Fontinalis are never hooked. 



63. CALLIERGON (Sull.) Kindb. (Cal-li-er-gon) 



A genus containing several species; one of which is 

 common in most localities, and one is found chiefly 

 in limestone countries. Name derived from the 



Greek for "something beautifully 



made." 



Plants growing on the ground in 

 swamps or wet, marshy places, or at the 

 margins of pools; bright green; fruit 

 occasional. 



Stems slender, usually 3-5 inches long; 

 more or less erect or sometimes pros- 

 trate; sparingly or pinnately branched. 



Leaves straight, large, spreading, sepa- 

 rated or crowded; light green. 



Seta about 2 inches long; reddish- 



Calliergon cordijolium ■, 



Capsule short-cylindrical, inclined, curved; reddish- 

 brown; mature in summer. 

 Operculum cone-shaped. 



Calliergon cordifolium (Hedw.) Kindb. {Eypnum 

 cordijolium Hedw.) is the common species and often 



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