GRIMMIACE^.] 81 [Orthotrichum. 



high. Leaves laxly imbricated when dry, quickly recurved from the 

 base when wet and again becoming spreading, oval at base, oblong- 

 linguiform, rounded at apex and obtuse or very shortly apiculate, 

 sometimes slightly toothed, revolute at margin in the lower half, 

 recurved in upper half to apex ; nerve very prominent at back, faintly 

 channelled in front, ending suddenly below the summit ; cells at base 

 hyaline quadrate with thin walls, passing gradually into roundish, with 

 very small papillae. Caps, semi-immersed, yellow, contracted below the 

 mouth when dry, 8-costate for all its length, when moist oval or oval- 

 oblong, suddenly contracted into a very short pedicel ; annulus persis- 

 tent, of 4 5 rows of small angular cells, the bands reddish-yellow of 

 4 7 series of quadrate cells, with strongly incrassate lateral walls, 

 stomata immersed, with the border cells very prominent. Teeth 8, 

 orange, bigeminate, when dry recurved against the capsule, more or less 

 perforated in the median line, very densely and finely papillose ; cilia 8, 

 filiform, long as teeth, yellow, faintly papillose, often 8 intermediate 

 cilia more or less developed. Vaginula with colourless paraphyses. 

 Lid conic, apiculate. Calyptra conic-campanulate, naked, lurid greenish 

 with a blackish apex, plicate to base. Male infl. at base of fruiting 

 branch. 

 HAB. On rocks and stumps in water; not common. Fr. 4 5. 



On the Cart and Calderwood burn (Don). Congleton, Cheshire and Nant-y-Belan, 

 N. Wales (Wilson) ! ! Eskdale below Ainsthorpe and Ripon (Baker 1858). Corwen 

 (Boswell 1859). Hurstpierpoint (Mitten) ! Cheviots (Hardy). Glenprosen (Fer- 

 gusson). Keswick (Hunt 1862). Callander (McKinlay 1864). R. Teign at Fingle 

 bridge (Brent). R. Dee, Llangollen (Nowell 1862) ! ! Ribble at Horton (Whitehead 

 and Ashton 1878) !! The Wye, Cheedale (Whitehead 1878)!! Glasgow (Lyle 1842). 

 Lowood, Windermere (Hunt 1867) ! ! In the Dargle, Wicklow and Cork (Taylor). 

 Glenavy river, Antrim (Stewart 1880) ! ! 



This fine but dingy moss is more frequent with us than in any other 

 part of Europe, and by the obtuse leaves is most allied to the next species. 

 From 0. affine Var. rivale it is readily separated by the stomata. 



12. ORTHOTRICHUM SPRUCEI Mont. 



Autoicous ; short, sparingly branched. Leaves erecto-patent, 

 oblong-spathulate, obtuse, apiculate, margin nearly plane. Caps, pyri- 

 form with 8 broad striae, calyptra campanulate, naked, teeth 8, 

 bigeminate, cilia 8 or 16. (T. LVII, C.) 



SYN. Orthotrichum Rogeri Var. ARNOTT in litt. 



Orthotrichum Sprncei MONTAGNE MS. SPRUCE in Lond. J. Bot. 1845, P- l86 - c - MUELL. 

 Synops. i, 699 (1849). BR. SCH. Bry. eur. fasc. 42, t. 2 (1849). WILS. Bry. br. 184, 

 t. 45 (1855). SCHIMP. Synops. 273 (1860), 2 ed. 338. BERK. Handb. br. m. 225 (1865). 

 HOBK. Syn. br. m. 93 (1873). VENTURI in HUSN. Muse. gall. 177, t. 48 (1887). 



