Hepaticce of North America. 45 



tinct. Thallus dark green or blackish, usually depressed, vari- 

 ously lobed and divided. Texture lax, vesiculose, with large 

 chlorophyll grains, frequently glandularly thickened at the 

 apex or in streaks along the middle so as to appear nerved. 

 Name from antkos, flower, and keras, horn, from the appear- 

 ance of the fructification. 



* Spores yellow; elaters yellow or with a yellowish tinge, 

 f Thallus usually smooth. 



1. A. laevis L. Thallus smooth, nearly plane above; 

 involucre 2 4 mm. high, trumpet-shaped when dry, the mouth 

 repand-toothed, often thickened, rarely scarious; capsule pale 

 brown or yellowish, 2.5 3.8 cm. high, the valves often twisted 

 when dry; spores rather small, nearly smooth, flattish, angular; 

 elaters rather short, geniculate, somewhat articulated, yellowish. 



Yar. major Aust. Larger in all its parts except the spores 

 and elaters. (A. Carolinian us Michx., A. laciniatiis Schwein.) 



Hob. Can. to the Gulf of Mexico and Gal.; the var. southward and 

 in Cal. (Eu.) 



Bib Syn. Hep. p. 586 ; Hep. Europ. p. 160 ; Torrey Bull. VI, 25. 

 Delin. Sulliv. Mosses U. S. t, VI. 

 Exsic Hep. Bor.-Amer. No. 123, 123b. 



2. A. Donnellii Aust. Dioecious; thallus plane, rather 

 narrow, smooth, very distinctly wide-nerved, deeply laciniate, 

 some wh ate crenate, copiously tuberous below; involucre large, 

 funnel form, the mouth incised; capsule yellow; spores and 

 elaters as in No. 1. 



Hob. Banks of Caloosahatchee R., Southwest Fla. (Austin); rare. 

 Bib Torrey Bull. VI, 304. 



3. A. Mohrii Aust. Thallus thick, opaque, subcristate, 

 lacunose, densely radiculose beneath, nerveless, tuber-bearing 

 within; involucre short, thickened, the mouth truncate, indis- 

 tinctly many crenate, often scarious-margined; capsule thick, 

 rigid, yellowish-brown or blackish, variously curved and twist- 

 ed, rather longpedicelled; spores ochreous, numerous, minutely 

 papillose, opaque or somewhat pellucid; elaters various, some 

 long and some short. 



Hab.Port Royal, S. C. (Austin), Mobile, Ala. (Mohr). 

 Bib Torrey Bull. VI, 304. 



ff Thallus more or less glandular. 



