HYPNACEAE 217 



forms large bright-green patches in very wet, swampy 

 places. When the stems arc more or less erect and little 

 branched, the plants might be mistaken for an acrocar- 

 pous moss unless the fruit can be found. The acrocar- 

 pous moss which grows erect in swampy places is Atda- 

 comnium palustre (p. 141). Its leaves are long, narrow 

 and crowded, while in Calliergon cordijolium the leaves 

 are broad at the base and separated. 



Range, Arctic America, Canada, and the northern 

 United States; Europe; Asia. 



Calliergon giganteum (Schimp.) Kindb. (Hypnum 

 giganteum Schimp.) is found in swamps in limestone 

 countries. It resembles C. cordifolium in general 

 growth, but it is much more branched and the leaves 

 are more crowded. 



Range, Greenland to Pennsylvania, west to the Pacific 

 Coast; Europe; Asia. 



64. ACROCLADIUM Mitt. (A-cro-cla-di-um) 



A small genus, one species of which is found in our 

 range. Name derived from the Greek for '' top " or 

 *' summit " and " branch," referring to the pointed 

 tips of the branches. 



Plants growing in loose tufts in swamps, bogs, and wet 

 meadows; briglit green, yellowish- or golden-brown ; glossy ; 

 not common ; fruit rare. 



