188 NEW BRITISH MOSSES. 
first, I have disputed the correctness of this decision, and on 
communicating my doubts to Dr. Montagne, he perfectly 
agreed with me in regarding the moss a nondescript, and 
bestowed upon it the name under which it is now published. 
Very lately, I have received from Dr. Arnott a scrap of an 
original specimen of O. Rogeri (gathered by Roger and named 
by Bridel himself) which has convinced me that O. Sprucii is 
truly distinct from it, and to this opinion Mr. Wilson now 
cordially assents. I am not disposed even to consider O. 
Rogeri its nearest ally ; the leaves of the latter are yellowish 
(as Bridel describes them), rather widely areolate, yet much 
less so than in O. Sprucii, far longer and narrower (not dif- _ 
fering much in form from those of O. affine) and by no means 
apiculate ; the capsule is very different in form (** elongato- 
oblonga") and the cilia, according to Schwaegrichen : * ex- 
ternis dimidio fere breviores." In the field, small specimens 
of O. Sprucii might be mistaken for O. pumilum, which seems 
to me to be the species most closely related to it; but a 
comparison of the characters given above of these two mosses 
will show that they may be readily distinguished on exami- 
nation. In fact, there is no European species with which 
O. Sprucii can possibly be confounded. Dr. Montagne 
remarks to me: ** Ses feuilles la feront re nus de tous les 
autres, méme de PO. Rogeri....Je mai pas vu une seule 
feuille sans apicule. C'est, avec la forme ligulée, le caractère 
spécifique le plus constant." 
16. Orthotrichum fenellum, Bruch. in Brid., * monoicum, 
minute pulvinatum; caule brevi, parce ramoso; folis 
patulis, siccitate laxe imbricatis, lanceolatis, acutiusculis, | - 
carinatis; capsula emergente subcylindracea, late striata, 
siccitate costata ; bilyýira conico-campanulata, subpilosa.” 
O. tenellum, Brickia Brid. Bryol. univ. 1, p. 786. 
Han. Very fine on trees by the river Cock, near Tadcaster, 
Yorkshire, as also by the Derwent at Matlock Bridge | 
Derbyshire. In several stations near Castle Howard, yet - 
nowhere abundant. “ Beaumaris ;” Mr. Borrer. “Onan 
apple-tree, Dundry, near Bristol ;" Mr. Thwaites. 
