216 HANDBOOK OF BRITISH MOSSES. 



mitriform, plicate ; peristome of four • short teeth ; leaves 

 minute, lineari-clavate, cylindrical at the base, flat above; 

 pericheetial leaves faintly nerved. 



1. T. Brownianum, Schwceff. ; sterile branches none ; peri- 

 chaetial leaves ovato-acuminate, faintly nerved at the base; 

 orifice of sporangium even. — Hook. §• Wils. t. viii. ; Eng. Bot. 

 t. 1422.; (Plate 19, fig. 7) ; Moug. $ Nest. n. 811. 



On gritty, quartzose, or sandy rocks. Rare. Scotland and 

 Ireland. Bearing fruit in July. 



Stem very short; lower leaves analogous to ramuli, slightly 

 thickened upwards, sometimes notched once or twice at the 

 apex ; lid obliquely rostrate, acute. 



The top of the columella, which is adnate with the teeth, 

 answers to the tympanum in Polytrichiei ; the veil resembles , 

 that of Orthotrichum ; the teeth have not a definite number 

 of striae. 



68. TETRAPHIS, Hedw. 



Monoicous. Sporangium subcylindrical, regular or slightly 

 bent ; veil raitriforrn, lacerated at the base ; peristome of four 

 triangular elongated teeth ; leaves well developed ; leaf-cells 

 hexagonal. 



1. T. pellucida, Hedw. — Hook. §■ Wils. t. viii. ; Eng. Bot. 

 t. 1020.; (Plate 19, fig. 8) ; Moug. $ Nest. n. 14. 



On the ground on shady banks or in peat; sometimes on 

 the roots of trees. Bearing fruit in autumn. 



Forming dense green patches. Stems about an inch high, 

 matted together at the base; leaves lanceolate or ovato-lan- 

 ceolate, entire; nerve ceasing below the apex; stem often 

 terminated by a cup-shaped cluster of leaves surrounding 

 long-stalked, lentiform gems ; fruitstalk an inch long ; lid 

 acute, conical. 



