CampT/lopus.] BRYACE.E. 77 



23. DICRANODONTIUM, Bruch & Schimp. (PL 1.) 

 Plants densely cespitose : stems slender, tomentose, dichoto- 

 mous or fastigiately branching. Leaves spreading or falcate- 

 seciind, rigid, long-setaceous subulate from a lanceolate base, 

 glossy; costa enlarged, filling the whole narrow part of the 

 leaf ; basilar areolation rectangular, hyaline, enlarged and 

 brown-colored at the angles. Flowers dioecious. Calyptra 

 large, cucullate, entire at base. Ca^^sule oblong or cylindrical, 

 soft, not striate or plicate when dry, erect on a long flexuous- 

 arched pedicel. Lid convex at base with a long acicular beak. 

 Peristome attached deep below the orifice of the capsule, of 16 

 narrow teeth cleft to near the base into two linear unequal 

 segments, distantly articulate, striolate to the apex, connivent 

 at apex when moistened, open when dry. Annidus none. 



1. D. longirostre, Bruch & Schimp. Tufts soft, yellowish 

 green above the thick reddish brown tomentum : leaves easily 

 detached, slightly sheathing at base, serrate or entire at the 

 apex, smooth on the back ; alar cells inflated, hyaline or reddish, 

 filling the whole base on both sides of the costa. — Bryol. Eur. 

 t. 88. Didymodon longirostrum^ Web. & Mohr, Tasch. 155. 



Hab. On sandstone rocks ; Alleghany Mountains ( Sullivant) ; Southern 

 Ohio {Lesquereux), sterile. 



24. OAMPYLOPUS, Brid. (PL 1.) 

 Aspect of Dicranum. Leaves broadly costate ; areolation 

 enlarged, hyaline, brown-tinted at the often excavated angles ; 

 costa sulcate or smooth on the back. Flowers dioecious. Ca- 

 lyptra cucullate, ciliate at base. Capsule symmetrical, solid, 

 generally striate. Lid subulate-beaked. Peristome as in 

 Dicranum. Annulus large, simple or compound. 



As the peristome, ciliate calj'ptra, and thick texture of the annulated 

 capsule are the essential characters which separate this genus from the 

 last, and as the plants are generally found sterile, it is often difficult to 

 determine their reference to Dlcranodontium or to Campylopus. As also 

 the characters of the leaves of both genera are variable, the American spe- 

 cies, all described from sterile specimens, are subject to criticism. The 

 descriptions, however, are made upon good and generally numerous 

 specimens. 



