DIOEANODONTIUM. /O 



per. 1. convolute, sheathing. Caps, elongate-cylindrical, 

 upright or subincurved, without striaa, brown, beak 

 subulate. Dioicous. 



Subalpine rocks. Rare. Autumn. 



Ben Lawers, 1866 (Dr. Stirton), Dumfries, Glen 

 Prosen. 



81. D. asperulum, Mitt. {Dicranodontium aristatum, 

 Auct.). Dioicous. Tufts 2 — 3 inches, tomentose. L. 

 falcato-secund, subulate from an ovate base, nerve 

 occupying the whole of the long subula, serrulate on 

 margin and spinulose at back, cells lax, pellucid, 

 larger and hyaline at basal angles. Caps, on a long, 

 twisted, yellow seta, oval-cylindric, plicate when old, 

 lid with a long, straight, subulate beak. 



Mountainous sandstone rocks. 

 Scottish mountains. 



82. D. uncinatum, Harv. {B. circinnatum, ed. 1). 

 Dioicous, in loose, irregular, light green tufts. St. 

 3 — 6 inches, dichotomous, geniculate or ascending, 

 radiculose. L. very long, secund, arcuate from an 

 oblong sheathing base, decurrent at angles, longly 

 subulate, concave, nerve flattened, covering one-fifth 

 of base and all the subula, which is denticulate at 

 back and margins, base laxly areolate in middle, with 

 narrower cells at margin, 



Pr. unknown. 



Ben Yoirlich, Clova, Ben Nevis, &c. 



18. DICRANODONTIUM, Br. and 8.* 



83. D. longirostre, B. and 8. {Bidymodon denudatus, 



* I have felt myself obliged to use this generic name for this 

 species, although Dr. Braithwaite, rightly I think, prefers the 

 older name Didymodon for it, but as that is used further on for 

 other species, I cannot adopt it here. 



