276 Mr. R. Spruce on the Musci and Hepaticse of Teesdale. 



gi'eatest plenty and luxuriance on junipers near the High Force, and 

 on birches by the side of Blea beck and on Cronkley Fell. 



The existence of an anmilus at the mouth of the capsule in the 

 genus Orthotrichiim appears to have escaped the notice of eveiy 

 writer on the subject of bryology : even Bruch and Schimper, 

 whose investigations have been so minute and elaborate, have 

 failed to detect it. To ~\Ir. Wilson is due the credit of first ob- 

 serving this organ in the capsules of 0. cupulatum, sent to him 

 by myself from the neighboiu'hood of York, in May 1842. At 

 that time we thought it might be peculiar to the species, but I 

 have since ascertained its presence in nearly every British spe- 

 cies of the genus ; and I may mention 0. Drummondii and cris- 

 pum as mosses in which it may be easily detected. In all cases 

 it is best seen by bending the teeth of the peristome inwards and 

 cutting them away, or by carefully taking out the inner membrane 

 of the capsule, of which the peristome forms the continuation. 



The annulus of O. Drummondii is very narrow, closely appressed 

 to the teeth of the peristome, of which it partakes the hue, so 

 that unless they be first removed, it is almost certain to be over- 

 looked. It is cU\ided into processes, of which two subtend each 

 tooth, so that the whole number of processes is thirty-two : they 

 are obtuse, sometimes perforated, and of very' fragile texture. 



133. Orthotrichum leiocarpum, B. and S. (O. striatum, Hedtc; 

 H. and T.) Frequent on trees. 



Bruch and Schimper assign the following very adequate reason 

 for changing the name of this species : " Comme c^est la seule 

 cspece du genre Orthotric qui ait une capsule depourvue de raies, 

 nous I'appelons O. leiocarpum (k fruit lisse) en rejetant la deno- 

 mination 'striatum,' qu'on avait conserve jusqu^ici.^^ 



134. 0. Lyellii, H. and T. On trees in many places, but barren. 



135. — pulchellum, Sm. On trees near streams; frequent. In 

 Hell Cleft I found a large var. growing on a stone, with a longer 

 capsule and paler outer peristome than ordinary. 



136. — rivulare. Turn. On stones iu the Balder; rare. The 

 leaves of specimens gathered in this locality are remarkably denticu- 

 lated at the apex ; but this peculiarity exists also, though in a less 

 degree, in specimens from Dr. Greville, gathered in Glen Dochart. 



137. — rupestre, Schleich. (O. rupincola, Funk.; H. and T.) On 

 fallen rocks and stones at the base of the High Force. 



138. — stramineum, Hornsch. "Monoicum, subpnlvinatum ; caule 

 ramoso ; foliis patulis, siccitate laxe imbricatis, lanceolatis, cos- 

 tato-carinatis, margine reflexis ; capsula pyriformi-oblonga, late 

 striata, e lutescente fusca ; calyptra campanulata, subpilosa ; 

 dentibus 8 bigeminatis, ciliis 8 jequalibus vel 16 alternis brevi- 

 oribus." — Bryol. Eur. 



O. stramineum, Ilorn.orfi. inrd. Brid. Bryol. Univ. i. p. 789. 



