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.
5. A. RUPESTRIS. Turn. (_A. Rothii_ W. & M.) St. scarcely ½ inch, loosely tufted; l. imbricate, falcato-secund, longly subulate from an ovate base, thickly nerved to apex, rigid almost black; per. l. larger convolute.
6. A. GRIMSULANA. Bruch. Much more robust than the last, rufous black; l. lanceolate acute broader, more solid, falcato-secund; per. l. broadly ovate not acuminate.
Brandsley Falls, Yorkshire, J. G. Baker 1858. Herb. Kew.—Ingleborough.
7. A. CRASSINERVIA. Bruch. Tufts depressed deep black, st. prostrate ascending, fragile; l. shining falcato-secund, subulate from an oblong base; nerve thick excurrent into the round papillose _subula_, margin entire, cells quadrate; per. l. erecto-patent convolute nerveless.
Alpine rocks; Hebden Bridge 1865; Scotland; Snowdon 1853.
8. A. FALCATA. Schimp. Smaller than last, very fragile black; l. falcato-secund, opaque, from a dilated obovate base abruptly lanceolate-subulate, nerve flattened, ending at or below the apex, which is erose at margin.
Snowdon 1865 and Cader Idris (Schimper); Perthshire (McKinlay).
9. A. NIVALIS. Hooker. St. longer tufted slender, l. reddish brown, falcato-secund, lanceolate-subulate, acute, gradually tapering and nerved to apex.
Alpine rocks at limit of perpetual snow; Ben Nevis, &c. Summer.
[Dr. Braithwaite is at present publishing in the “Monthly Microscopical Journal” a Monograph of this genus, but as he has only got some three or four species described, I regret that I cannot avail myself of his valuable researches, and can only publish such species as are known to me. His division of species is as follows:—
A. 1 _S. cymbifolium_ Ehr. B. 2 _S. tenellum_ Ehr. 3 _S. rubellum_ Wils. 4 _S. neglectum_ Angst. 5 _S. subsecundum_ N. von E. C. 6 _S. molle_ Sulot. 7 _S. rigidum._ N. H. & S. D. 8 _S. squarrosum_ Pers. 9 _S. teres_ Angst. 10 _S. acutifolium_ Ehr. 11 _S. strictum_ Lindb. 12 _S. fimbriatum_ Wils. 13 _S. Lindbergii_ Schp. 14 _S. intermedium_ Hoff. 15 _S. cuspidatum_ Ehr.]