Grimmiace^.] 9 [Grimmia. 



Var. y. rivularis (Brid.) W. M. 



Laxly caespitose, naked at base, fasciculate branched, 2 — 3 in. long, 

 lurid or blackish-green. Leaves ovato-lanceolate, rather obtuse ; caps, 

 shorter, when dry and empty turbinate, wide-mouthed. 



Syn. — Grimmia rivularis Brid. in Schrad. Bot. Journ. iii, 276. Sp. muse. I, 97 ; Mant. 33 ; 

 Bry. un. i, 166. Turn. Muse. hib. 21, t. 2, f. 2. Sm. F1. brit. 1200 ; Eng. Bot. t 1345. 

 ScHWAEQ. Suppl. I, P. I, g6, t. 23. 



Grimmia apocarpa var. rivularis Web. M. Bot. Tasch. I2g. Schkuhr Deutsch. kr. g. 47, 



t. 21. Hook. T. Muse. br. 37. Nees Hsch. Bry. germ, ii, t. 18, f. 4. 

 G. alpicola p. rivularis Wahlen. F1. lapp. 320 ; Fl. earp. 339. 

 Schistidium afocarpum var. rivulare Br. Sch. Bry. eur. WiLS. Bry. br. 



Hab. — On stones in streams. 



Brandon Mountain, Ireland (Wilson 1829) ! Ben Lawers and Campsie, Glasgow 

 (Gardiner) ! ! In Meavey and the Teign (Holmes). Romiley, Cheshire (Whitehead 

 1862) ! ! Aber (Wilson) ! ! Ingleton (West 1862) ! ! Bradshaw Clough", Bolton 

 (Rogers 1868) ! The Hodder and Mitton, Clitheroe (Holt 1885) ! Belfast (Stewart). 



Var. L gracilis (SchUich.) W. M. 



Stem longer, more slender, decumbent ; leaves patent or homomallous, 

 serrate at apex, often black ; caps, secund, teeth long and slender. 



Syn. — Grimmia gracilis Schleich. Cr. helv. cent. 3, u. 14. Schwaeg. Suppl. I, P. I, 98, t. 20. 

 Brid. Mant. 33, Bry. univ. 170. Schultz Suppl. Fl. Starg. 67. 



Grimmia striata Turn. Muse. hib. 20, t. 2. f. i. Brid. Mant. 34, Bry. univ. i, 172. 



Grimmia Schleicheri Spreng. Einleit. in d. Stud. kr. g. 277, t. 7, f. 5, 9. 



Grimmia apocarpa p. gracilis Wee. Mohr Moost. 131. Schkuhr 47, t. 21, f. 3. 

 RoEHL. Deutsch. fl. iii, 47. Hook. Tayl. Muse. br. 37. Nees Hsch. Bry. germ, ii, P. 

 I, t. 17, f. 4. 



Grimmia trichodon Brid. Bry. un. i. 171. 



Schistidium apocarpum /?. gracile Bry. eur. 7, t. 4. WiLS. Bry. br. 150. 



Hab — Stones in streams. 



Crow Road, Campsie (Hunt 1866) ! Glen Dole, Canlochan and Sidlaw Hills (Gardiner) ! ! 

 Ben Lawers. Killarney (Moore). Ptarmigan m. (Holt 1880) ! Hampton Lucy and 

 Earlswood, Warwick (Bagnall). 



Var. t. pumila Schimp. 



Plants very small and slender; leaves narrower, imbricated when dry, 

 uppermost only with hyaline points ; caps, small, concealed in the peri- 

 chaetium. 



Syn. — Grimmia apocarpa var. e. pumila Schimp. Synops. 2 ed. 243. 



Hab. — Alpine rocks. 



Glaslyn (Holt 1883) ! Miller's dale (Holt 1879) ! Black Force, Lowgill Fells, Yorks. 

 (Binstead 1886) ! ! Borrabank Fell, Loweswater (Waterfall 1885) ! ! 



So variable is this moss, that it is difficult to know where to stop in our 

 series of varieties, which might be extended beyond the number given in 

 Bryol. germ, and yet not include all the forms, which again are connected by 

 intermediate states. Sometimes the leaves are all muticous, broad and 

 obtuse, entire or bluntly serrate at apex, sometimes they run out into longish 

 hairs— the Var. incana Nees Hsch. — while the colour varies from green, to 

 fuscous or black. The Var. pumila is an elegant little plant, scarcely 

 separable from G. conferta but by the stouter build and coarser areolation. 



