TRICHOSTOMEI. 249 



peristome with numerous subdivisions. — Hook. X$ Wils. t. xliv. ; 

 (Mouff. $ Nest. n. 1008.) 



On stones or trees, near rivulets, or on stumps. Wales, 

 Bristol, and south of England. Bearing fruit in spring. 



The short variety alone is found in Great Britain. Stems 

 about an inch long, dull-green, but not black; fruitstalk \ in. 

 long; cells of lid spirally arranged as in Tortula, to which, es- 

 pecially to T. subulata, this form bears a strong resemblance. 



The stems in the normal form are 3 inches or more long, 

 and the leaves not so acute ; the cells are small, irregularly 

 quadrato-hexagonal, with a few longer cells at the base ; the 

 margin reflexed below, and slightly thickened above; some- 

 times acrocarpous, sometimes cladocarpous. 



2. C. fontinaloid.es, P. Beauv. ; fasciculato-ramose ; leaves 

 elongato-lanceolate, acute, keeled; nerve excurrent; margin 

 thickened ; perichaetial leaves submembranous ; sporangium 

 immersed. — Hook, fy Wils. t. xi. ; Eng. Bot. t. 557. ; (Plate 

 22, fig. 2) ; Mouff. fy Nest. n. 510. 



On stones, in rivulets, or on the border of lakes, espe- 

 cially in calcareous districts. Bearing fruit in early spring. 



Dioicous; forming large, loose, olive-green tufts several 

 inches long, floating in the water, or erect in drier localities. 

 Fruitstalk very short ; sporangia cladocarpous, oval or oblong ; 

 lid conico-rostrate; peristome red, fugacious; spores rather 

 large, green. Above the short vaginula, I find a thin, irregular, 

 jagged ocrea. 



Obher XXVIII. TRICHOSTOMEI, Br. & Schimp. 



Sporangium erect or pendulous; veil cucullate, subulate; 

 peristome of thirty-two filiform teeth, distinct or united at 

 the base, which is often tubular, frequently approximating in 

 pairs and sometimes spirally twisted. 



