92 BRYACE^. [Ceratodon. 



29. CERATODON, Brid. (PI. 1.) 

 Plants dividing by innovations from under the periclia^tium. 

 Leaves lanceolate, pajiillose, or nearly smooth in the upj^er j^art. 

 Flowers dioecious. Capsule ovate-oblong, striate, deeply fur- 

 rowed when dry, subcernuous. Teeth of the peristome cleft into 

 two equal strongly articulate segments, papillose above. 



1. O. purpureus, Brid. Plants fastigiate, branching, dirty 

 or dark green : leaves carinate, entire, reflexed ; borders opaque, 

 nearly smooth ; areolation distinct : capsule short-necked, dark 

 red, polished, horizontal, quadrate or pentagonal when old and 

 dry; lid conical, short-beaked; teeth purple; annulus large, 

 revoluble. — Bryol. Univ. i. 480; Bryol. Eur. t. 189, 190; 

 Braithw. Brit. Moss-Fl. i. 173, t. 26, D. Ifniitm purjyureum, 

 Linn. Sp. PI. 1111. Dicranimi purpureum.^ Hedw, Sjjec. Muse. 

 136, t. 36. 



Var, xanthopus, Sulliv. Pedicel of the capsule pale yel- 

 low or whitish. 



Var. aristatus, Aust. Leaves narrower, with a long ex- 

 current costa : capsule and pedicel pale colored. — Muse. Appal. 

 n. 117. 



Hab. Almost everywhere, and extremely variable. Var. xanthopus 

 common in California; the last on sandy barrens of New Jersey (Austin). 



2. 0. minor, Aust. Differs from the preceding in the short 

 stem, half a cm. long, the leaves lanceolate, aristate by the long 

 point of the excurrent costa and serrulate toward the apex, the 

 capsule sliorter, the teeth narrower, articulate only from the 

 middle downward and very narrowly margined. — Coult. Bot. 

 Gaz. ii. 89. 



Hab. West of Frazer River (Macoun). 



The author compares it to his var. aristatus of C. purpureus, which, 

 however, is more robust, has the costa not excurrent into as long a point, 

 and the peristome of typical character. The difference therefore consists 

 especially in the more delicate texture of the peristome. 



30. TRIOHODON, Schimp. 



Plants small, radiculose at base only, subcespitose. Leaves 



long-subulate from an enlarged sheathing obovate or oblong 



base, crispate, smooth ; areolation linear-rectangular, gradually 



longer to the base. Flowers dioecious ; pericha3tium sheathing. 



