GRIMMIACE^.) 40 \Grimmia. 



Trichostomntn cataractarnm HARTM. Skand. fl. 3 ed. 283 (1838). 

 Grimmia aquatica C. MUELL. Synops. i, 800, excl. syn. (1849.) 



Dioicous ; in lax wide depressed mats, dull or yellow-green above, 

 ferruginous below. Stems elongated, more slender, 14 in. high, 

 ascending, repeatedly dichotomous, less rigid, dense-leaved. Leaves 

 when dry laxly incumbent, when moist suddenly recurved, then erecto- 

 patent on all sides, or subsecund, from an oval-oblong base, gradually 

 lanceolate, obtuse, muticous, quite entire, canaliculate, unequally 

 recurved and not incrassate at margin, unistratose ; nerve strong, 

 reddish brown, ending in the apex ; cells at base long, very narrow, 

 above minute, incrassate, yellow, strongly punctulato-crenulate at 

 margin. Perieh. bracts sheathing, thin, nerve shorter. Caps, pseu- 

 dolateral, on a longish pale brown seta, elongate-elliptic, erect, 

 leptodermous, ferruginous, often scarce overtopping the elongated 

 innovations ; calyptra 5-lobed, acicular ; lid acicular, straight, red 

 f length of caps. ; annulus broad ; teeth rufous, bipartite, the legs free, 

 entire or partly cohering, perforated. Male infl. terminal, bracts ovate, 

 shortly acuminate. 

 HAD. Dripping rocks and waterfalls. Fr. 3 4. 



Cronkley Fell, Teesdale (Nowell 1851)!! Bleabeck Scarr and White Force, Teesdale 

 (Baker 1856) ! Snowdon (Wilson) ! ! Beddgelert (Coward 1858) ! Ben Lomond 

 (Dr. Wood 1859) ! Glengariff (Hunt 1864) ! Bowness (Barnes 1869) ! ! Lochgoil 

 head (Hunt 1866). Taycleave (Holmes). Lough Bray (D. Orr). Brandon and 

 Macgillicuddy's Reeks (Moore). Isle of Man (Holt). Slievedonard (Lett). Brecon 

 Beacon (Boswell 1883). Tyn-y-gros and Crib Goch (Holt 1882). 



In appearance this much resembles G. patens, but apart from the wings 

 on the nerve of that species, the leaves in G. aquatica are obtuse, quite entire, 

 with the basal areolation much more sinuose ; from G. aciculans it differs in 

 the slender sterns and narrower lane, leaves, and the basal areolation is 

 much coarser. 



32. GRIMMIA OBTUSA (Sm.) Lindb. 



Dioicous; short, densely pulvinate. Leaves quite beardless, ovate- 

 oblong, gradually acuminate, obtuse at point, nerve lost far below apex, 

 margin narrowly revolute. Caps, oblong, narrowed at mouth, lid 

 acicular, peristome fugacious, irregular, teeth with 2 unequal legs. 

 (T. LI, E.) 



SYN. Bryum hypnoldes alpinum, operculls obtusis DILL. Hist. muse. 371, p.p. t. 47, f. 30 

 (1741) et Herb. 



Bryum hypnoides 8. HUDS. Fl. angl. 411 (1762). 



Trichostomum obtusum SM. Fl. brit. 1244, excl. syn. BRID. (1804), Comp. fl. brit. 

 2 ed. 171 (1816). 



Dicranum aciculare o. ptimilnm TURN. Fl. hib. 67 (1804) ? 

 Trichostomum patens W.-ARN. H. in HOOK. J. Bot. i, 95 (1834). 



