HYPNACEAE 221 



one side; most frequently yellowish-green, more rarely 

 bright green or brownish. The fruit is rare. 



Hygrohypnum palustre (Huds.) Loesk. (Ilypnum 

 paluslre Huds.) resembles H. ochraceum in a general 

 way, but is much less frequent, and the stems are 

 shorter and the leaves less curved and turned to one 

 side; duller in color. The lower part of the stems is 

 often leafless. The fruit is rare. 



Hygrohypnum, with the exception of H. dilaiatum, 

 may be distinguished from other mosses growing on 

 rocks in the beds of brooks by the leaves being more or 

 less curved and turned to one side. Plants with numer- 

 ous short branches will most likely be H. eugyrium var. 

 Mackayi. Mixed with it will sometimes be found Rha- 

 comitrium (p. 1 13), with leaves broader, equally spread- 

 ing when moist, and closely folded when dry. Plants 

 with longer stems will most likely be H. ochraceum. 

 Compare Hygroamblystcgium (p. 211), Brachythecium 

 plumosum (p. 247), and B. rivulare (p. 247), Oxy- 

 rhynchium (p. 251) and Bryhnia (p. 254). 



66. CTENIDIUM (Schimp.) Mitt. (Cte-ni-di-um) 



A genus containing several species, one occurring in 

 our range. Name derived from the Greek for '' diminu- 

 tive " and a '^ comb," referring to the very regular 

 pinnate branching. 



