1858.] THE ORTHOTRICHEiE OF YORKSHIRE. 573 



calyptra yellow, the apex brown. Exposed trees, in dry sub- 

 alpine stations. 



Stem-leaves yellowish, acuminate, those of the perichsetium 

 very slightly obtusate. Areolse more distant than in the common 

 form, with large papillae. 



Misled by imperfect specimens of 0. fastigiatum, B. and S., 

 from Schimper himself, in a paper read before the Edinburgh 

 Botanical Society, May, 1858, I came to the conclusion that it 

 differed in no essential character from the present variety of O. 

 affine. I still think intermediate forms may be met with, but in 

 deference to the opinion of Mr. Mitten, retain it as a species. It 

 will be understood that the stations given for O. fastigiatum, ex- 

 cept Greta Bridge, belong to the present variety. Compare the 

 cell-structure of 0. fastigiatum {a) with the varieties of 0. affine 

 /S, etc. The engraver has represented some of the cells of O. 

 affine filled with granules; we commonly find^two or three ap- 

 parent nuclei, perhaps the bases of papillae. 



7. rivale ; leaves lurid-green, very obtuse ; capsule oblong, ex- 

 serted on a longer pedicel ; cilia shorter ; calyptra narrow, lurid 

 green. Trees by streams. July. Laskill, North Yorkshire. 

 First found by Mr. Wilson near Congleton Cloud, Cheshire. 

 A remarkable variety, apparently intermediate between 0. affine 

 and 0. rivulare. The leaves are shorter than in the latter; 

 areolae larger; capsule pale and thin, with narrow strise. Cap- 

 sules shorter, less tapering into the pedicel, and peristome 

 smaller than usual in 0. affine. May it not be a hybrid be- 

 tween the two species ? 



11. 0. fastigiatum, Bruch. Leaves broadly lanceolate, acu- 

 minate, imbricated when dry; capsule stronger, with broader 

 strise ; calyptra yellow, with brown apex. Greta Bridge, York- 

 shire. May, Jxme. Through the kindness of Mr. Borrer I have 

 seen the original tuft, and with the exception of two stems 

 which seem correctly named, it belongs to 0. stramineum. 



Forming close, neat tufts. The perichsetial leaves are acute,, 

 not obtusate, as in 0. affine. The texture is thinner, with 

 smaller papillae, and rather larger areolae. 



*** Peristome double, outer 0/ 16 teeth. 

 {Structure of ca/psule as m Aifince.) 



12. O. rupestre, Schleich. Leaves brown, acute, rigid; cap^ 



