Sub-genus Ctenium 



The leaves have longitudinal folds with the apex turned to 

 one side. 



The spore-cases are raised on long pedicels; they are cylin- 

 drical-oblong, arched, and with broadly conical lids 

 tipped with a point. 



Stem-leaf. 



Cells at base of leaf. 

 C. crista-castrensis. 



Female plant. 



The Knight's Plume Moss, Hypnum (Ctenium) crista- 

 castrensis, L. See Plate XXVIII. 



Habit and habitat. In loose, rigid, yellow-green tufts on 

 decaying logs, in mountainous regions. 



Spore-case with lid. 



Leaf at base 

 Spore-case without lid. of pedicel. 



C. crista-castrensis. 



Paraphyllia. 



Name. The great Linnaeus named this pretty moss crista- 

 castrensis from its resemblance to a military plume or crest Latin 

 crista, a crest, and castrensis, military. 



Plant (gametopbyte).The stems prostrate, 3 to 5 inches long, 

 the tips upright ; simple or twice-branched, closely and 



297 



