Andrecea.] ANDEE^ACE^. 25 



Order II. ANDRE^ACE^. Schizocarpous Mosses. 



Plants ascending from a prostrate rooting base, of dark color 

 and generally black, branching by innovations from under the 

 flower-bearing apex, and dichotomous. Leaves thickish, open 

 or falcate-secund, papillose or warty ; areolation circular or 

 hexagonal in the upj^er part, quadrate in the lower, sinuous- 

 vermicular at base. Flowers monoecious or dicecious, terminal, 

 gemmiform. Calyptra very thin, closely adherent. Capsule 

 oval, immersed in the large perichsetium before maturity and 

 then protruded by the elongation of the receptacle or vaginule, 

 splitting from the collum upward into 4 or rarely 6 equal seg- 

 ments, which cohere at the quadrangular apex. Spores small, 

 at first coherent by fours in glomerules. 



Plants cespitose, growing on rocks in alpine or subalpine localities; all 

 the American species monoecious. 



1. ANDREW A, Ehrh. (PI. 1.) 



The only genus. Characters as of the Order. 



1. A. petrophila, Ehrh. Leaves spreading, rarely secund, 

 ovate and oblong-lanceolate, concave, oblique at the hyaline 

 crenulate apex, papillose on the back, ecostate; perichaetial 

 leaves convolute, light-yellow. — Beitr. i. 192 ; Bryol. Eur. 

 t. 628 ; Braithw. Brit. Moss-Fl., i. 6, t. 1, A. A. rupestris, 

 Hedw. 



H AB. Wet granitic rocks, on high mountains ; very variable. 



2. A. rupestris, Turn. Leaves erect, subimbricate at the 

 ovate base, open, linear-lanceolate, spreading, incurved or sub- 

 secund at the * apex ; costa depressed, excurrent ; areolation 

 punctiforra, striate. — Muse. Col. Hyb. Spec. 14 ; Bryol. Eur. 

 t. 631. Jnngermannia rupestris, Linn. Fl.-Suec. 1045. A. 

 Eothii, Web. & Mohr ; Braithw. 1. c. 12, t. 2, A. 



Hab. On rocks, with the preceding; common in the mountains of 

 Georgia and Carolina, descending to the plains northward. On gneiss 

 rocks near Yonkers, New York, on the borders of the Hudson [E. C. 

 Howe). 



