HvPNACEiE.J 43 [Amhlystegium. 



twisted ; nerve vanishing below apex ; cells at base quadrate, a row 

 above and at basal angles rectangular, upward becoming linear, sub- 

 flexuose and opake. Perichaetium large polyphyllous, outer bracts 

 squarroso-patulous, upper erect, lanceolate, acutely acuminate, not 

 plicate. Fruit as in ^ . Sendtneri. 



Hab. — Bogs, not common. Fr. 6 — 7. 



Spofforth, Yorkshire (C. y. Wild, 1878) ! ! Strensall- common, Yorkshire (Holt 1886) ! ! 

 Southport (Holt 1881) ! ! Kinder Scout (Holt). Cong, Galway (Moore). Wilderley 

 hill and Stapeley hill, Shropshire (R. de G. Benson 1892) ! ! 



This moss appears to me sufficiently distinct from revolvens, and worthy to 

 rank as a species in this closely allied group. A. Ccssoni seems to be only a 

 more robust form with more acuminate leaves. The cells of leaf are much 

 narrower and longer than in A. Sendtneri. 



24. AMBLYSTEGIUM REVOLVENS {Sw.) De Not. 



Autoicous ; in large soft rufous or blackish purple tufts, irregularly 

 branched. Leaves densely crowded, circinate, lanceolate, acuminate, 

 not plicate, nerved beyond middle ; cells very narrow, the angular few, 

 elongate. (T. XCIII, B.) 



Syn. — Hypnum revolvens Swartz Muse. suec. 38, t. 7, f. 14 (1799)- Smith F1. brit. 1327 

 (1804), Eng. Bot. t. 2073. Turn. Muse. hib. i8g (1804). Schwaeg. Suppl. I, P. II, 299, 

 t. 95 ? (1S16). Brid. Mant. 180 (1819). Funck Moost. 67, t. 52 (1821). Grev. Mem. 

 Wern. Soc. iii, 258. Hueben. Muse. germ. 604 (1833). C. Muell. Synops. ii, 323 

 (1851). WiLS. Bry. brit. 388 (1855). Br. Sch. Bry. eur. fasc. 57 — 6i, p. 32, t. 21 

 (1854), Synops. 610 (i860), 2 ed. 736. Berk. Handb. 119, t. 10 (1863). Milde Bry. 

 siles. 353 (i86g). Hoek. Synops. 169 (1873). BouL. Muse. Fr. 55 (1884). Lesq. James 

 Moss. N. Amer. 384 (1884). Husn. Muse. gall. 390 (1894). Dix. James. Stud. Handb. 

 464 (1896). 



H. xerampelinum Vill. PI. Dauph. iii, go2. 



Hyfnum aduncttm Var. revolvens Web. Mohr Bot. Taseh. 361 (1807). Brid. Sp. muse. II, 

 223 (1812), Bry. univ. ii, 625 (1827). Hook. Tayl. Muse. br. iii (1818). 



Amblystegium revolvens De Not. Epilogo 140 (1869). 



Hypnum intermedium R. revolvens Sanio Beschr. Harpid. 58 (1885). 



Autoicous ; in large soft rufous-purple or blackish tufts. Stem 

 weak, flexuoso-erect, fastigiate, branches distant, simple or sparingly 

 subpinnate. Leaves circinate-falcate, very dense, from an ovate base, 

 sublineal-lanceolate, tapering into a long slender acumen, not sulcate ; 

 nerve slender, vanishing at f length, cells very narrow, linear, vermicular, 

 at angles few, lax, elongate, hyaline. Perich. bracts long, pale, lower 

 ovate at base, erect with a filiform apiculus, recurved, nerveless, inner 



