HYPXKI. 123 



copodioides. It forms the subgenus Rhytidlum of Schimpcr, 

 separated principally on account of the waving of the leaves. 

 The two kinds of fruit often grow in distinct tufts, and ac- 

 cording to Wilson, where the perigonia occur, the antheridia 

 are often imperfect. 



*** Leaves striated, nerveless or two-nerved, toothed. 



71. H. Crista-castrensis, L. ; stem suberect, pectinate; 

 leaves circinato-secund, ovato-lanceolate, acuminate, plicate, 

 toothed, two-nerved at the base ; sporangium oblong, curved, 

 cernuous; lid conical. Hook, fy Wils. t. xxvii. ; Eng. Bot. 

 t. 2108. ; (Plate 11, fig. 2) ; Moug. $ Nest. n. 140. 



In woods and on rocks in mountainous districts. Bearing 

 fruit in summer. 



Dioicous ; forming yellow-green, loose tufts. Stem rigid, 

 simple or producing one or two innovations, closely pectinate; 

 branches slightly recurved, distichous, rarely forked; stem- 

 leaves ovato-lanceolate, falcate, strongly attenuated, toothed, 

 deeply sulcate, with two short nerves at the base, which are 

 sometimes very faint ; branch-leaves narrower and more cir- 

 cinate : margin in all more or less recurved ; paraphylla nar- 

 row lanceolate; perichsetial leaves sulcate; fruitstalk 1-2 

 inches long, even ; sporangium oblong, cernuous, solid, more 

 strongly, arcuate when dry ; lid convex. 



Sometimes confounded with the next, but a much larger 

 plant, with a larger sporangium and less acute lid. The pec- 

 tinate arrangement of the branches gives the plant a feather- 

 like aspect, from whence it derives its name. 



72. H. molluscum, Hedw. ; stem suberect or procumbent, 

 closely pinnate ; leaves crowded, circinate, secund, cordato- or 

 ovato-lanceolate, acuminate, toothed, nerveless or two-nerved ; 

 sporangium short, ovate; lid conical, acuminate. Hook.tyWils. 



