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



By Swartz it was placed in Didymodon ! Hornschucli formed of 

 it his g-enus Ptijchostomum, and divided it into several spurious 

 species. But I am doubtful whether it can be considered distinct 

 from Bi\ inclinatum ; the adhesion of the inner peristome to the 

 outer is often only partial, and if this character be abstracted little 

 is left to separate them. After having compared a great many 

 states of both mosses, I can only find that the leaves of Br. cer- 

 nuum are broader, yet tapering more suddenly into a slender 

 point, and that the outer peristome is shorter. If these charac- 

 ters prove constant, per/iajjs they may suffice to maintain B?'. cer- 

 nuum in the rank of a species, but at present I hardly expect such 

 will prove to be the case. 



32. Bryum crudum, Huds. Abundant, especially in the crevices of 

 shady rocks. This species, though in habit one of the most marked 

 of all Brya, varies considerably in the direction of its capsules : some- 

 times, as in specimens gathered by Ettersgill beck, they are nearly 

 or quite erect ; at others perfectly pendulous, as on Cronkley Fell. 



33. Br. inclinatum, B. and S. " Hermaphroditum ; caule brevius- 

 culo, radiculoso-tomentoso, parce ramoso ; foliis ovato-lanceo- 

 latis, longius acuminatis, integris ; capsula nutante vel pendula, 

 ventricoso- vel ovato-pyriformi, microstoma, annulata, operculo 

 convexo, apiculato ; peristomio interno libero, ciliis rudimenta- 

 riis seu nullis." — Bryol. Europ. 



Pohlia inclinata, Swartz, Muse. Suec, pp. 45, 96. t. 5. f. 11; Brid. 

 Mant. Muse; Schivcegr. Suppl. i. pt. ii. p. 73. t. 63. 



Br. turbinatum, var. Muscol. Brit. ; Walker- Arnott, Dispos. meth. 



However questionable may be the propriety of disuniting Br. 

 cernuum and inclinatum, I cannot doubt that the latter is a very 

 distinct species. I gathered in Teesdale, between the two, above 

 twenty varieties, all equally distinct from Br. ccespititium, to which, 

 in point of fact, Br. inclinatum is far more closely allied than to 

 Br.turbi7iatum,\\\\ii\\QX it has been referred by Walker- Arnott and 

 the authors of ' Muse. Brit.^ Br. inclinatum may be distinguished 

 at sight from Br. caspititium by its capsule tapering nearly equally 

 to each extremity (often exactly spindle-shaped) and by its far 

 smaller and more pointed operculum ; besides, the leaves have less 

 of that silky appearance to be observed in the other, their nerve 

 is less produced, and they are fui*nished with a border of thi'ee 

 rows of narrow cellules. The inflorescence is constantly herma- 

 phrodite (dioicous in Br. ccespititiian) ; the inner peristome wants 

 the intermediate cilia, or, if present, they are imperfect and desti- 

 tute of the large and well-developed lateral hooks (appendiculse) 

 so remarkable in Br. ccespititium ; and lastly, the seeds are three 

 times the diameter of those of Br. ccespititium. 



Although Br. inclinatum and cernuum exist abundantly in Tees- 

 dale, only a single alpine habitat was observed for Br. ccespititium. 



