1G2 HISTOEY OF BUITISH MOSSES. 



Var. Unioides : steins two or three inches high; leaves 

 longer and patent. 



Var. brevicaulis: stems half an inch high; fruit-stalks 

 elongated. 



13. To RTULA GRACILIS^ Hook, and Grev. {Slender Screw 

 3I0SS.) Stems elongated, somewhat branched; leaves lan- 

 ceolato-acuminate, erect, rigid when dry, very straight, the 

 margin recurved ; capsule oblongo-ovate ; lid rostrate, very 

 short. — Un(/. Fl. p. 47. Barbula gracilis, Hull. Sj/n.pt. 1. 

 p. 609. 



Scotland, Dickson. Near Cork, Tr. Spring. Nearly 

 allied to T.fallax, from which it is distinguished by a more 

 slender habit, and leaves more rigid, erect, and straight. 

 Its colour is a brownish-green. 



Tortula stellata, recorded as British in the Eng. M. p. 46, 

 on the authority of Dickson, is omitted by us, as it is only 

 found growing in the West Indies, and probably got mixed 

 by accident with that gentleman's British species. 



ZIGOTRICHIA, Brid. 



So named from the teeth of the peristome being united 

 in pairs, a character common to many genera. 



