DIVISION I. ACROCARPI. (Genera 1-72.)
1. ANDREAEA. Ehr.
a. L. nerveless.
1. A. PETROPHILA. Ehr. (A. rupestris Hedw.) St. 1/4 inch loosely tufted, with fastigiate branches; l. erect imbricate, with a sheathing base, generally secund, ovate or ovate-subulate, tapering above, and rather obtuse; papillose, areolæ dotted; per. l. larger; all reddish brown.
Sub-alpine rocks, frequent. V. VI.
2. A. alpestris. Schimp. St. taller, densely tufted, with slender branches; l. crowded, very small, patent on all sides when moist, ovate, or ovate-lanceolate, obtuse, areolæ quadrate at margin; per. l. shorter and more obtuse.
Damp alpine rocks. Glen Callater; Perthshire.
3. A. obovata. Thed. "Densely tufted, blackish brown, tall and robust; l. somewhat like those of alpina, from an imbricate base ovate-panduriform, gradually lanceolate, nearly smooth, glossy, quite entire at margin, areolæ much laxer." Dr. Braithwaite, Jour, of Bot., VIII. p. 95.
Glen Callater.
4. A. alpina. Turner. St. tall 1-3in. densely tufted, with long fastigiate branches; l. imbricate, spreading, reddish or purplish brown, obovate, almost panduriform concave; per. l. larger elliptic sheathing, acute, areolæ dot-like.
Alpine rocks. V. VI.
c
