TKICHOSTOMEI. 255 



with very little chlorophyll, below broadly and nearly exactly 

 rectangular. 



I omit T. stellata, Smith (Bryum stellatum, Dicks.), as it 

 has never been found on the Continent, and is in all pro- 

 bability a tropical Moss, admitted by some mistake into the 

 list of British Mosses. 



** Leaves narrow, lanceolate. 



13. T. squarrosa, De Not. ; dioicous ; loosely tufted ; leaves 

 recurvo-squarrose, from a broad sheathing base, lanceolate, 

 slightly undulated, serrulate at the apex ; margin plane ; 

 nerve subexcurrent ; sporangium erect, oblong, slightly 

 curved; lid concave, subulate; ring simple. — Hook, fy Wils. 

 t. xliii. 



On dry hills. Dublin and Sussex. Bearing fruit on the 

 Continent in May and June. 



Forming yellow-green loose tufts. Stem brittle, erect or 

 procumbent, an inch or more long ; leaves crisped when dry ; 

 leaf- cells above minute, very lax below; teeth twisted. 



14. T. tortuosa, Iledw. ; dioicous ; pulvinate ; stem 

 elongated, dichotomous ; leaves crowded, spreading, curled 

 when dry, linear-lanceolate from an ovate translucent base ; 

 margin plane, undulated ; nerve excurrent ; sporangium erect, 

 ovato-oblong, sometimes curved ; teeth much twisted. — Hook. 

 $ Wils. t. xii.; Eng. Bot. 1. 1708. ; {Moug. # Nest. n. 314.) 



On rocks, especially such as are calcareous, as at Matlock. 

 .Bearing fruit in summer. 



Forming yellow-green tufts. Stems ^-3 inches long ; leaves 

 very long; leaf-cells minute above, filled with chlorophyll, 

 translucent and rectangular, but rather narrow below ; basal 

 membrane very narrow. 



15. T. eonvoluta, Swartz ; dioicous ; densely tufted ; leaves 



