TORTULA. 157 



trum of the lids, that 1 feel the greatest difficulty in com- 

 prehending the T. encrvis and T. hrevirodris of authors." 

 Accordingly he only records T. rigida. 



They have always been favourite Mosses with us, for 

 nothing can be more simply neat than their smoothly 

 polished and nicely curved leaves, each tuft crowned with 

 a seta and capsule. We should like much if some of om- 

 fair friends skilled in the mysteries of wax-flower manufac- 

 ture would try their hand on a patch of the tliick-leaved 

 Tortula, for the leaves have a consistence suited to make 

 them subjects of such an experiment. 



** Leaves more or less memhranous. 

 t Perich(Btial leaves convolute, sheathing. 



4. ToKTULA coNVOLUTA, Sw. [Convolute Screw Moss.) 

 Stems rather short; leaves oblongo-lanceolate, acute, their 

 margins plane, those of the pericha^tium remarkably invo- 

 lute ; capsule oblong ; lid rostrate. — Eng. FL p. 44<. Bar- 

 bula convoluta. Mull. Si/n. pt. I. p. G15. 



Banks, and on moist clayey soil. Tr. Spring. The con- 

 volution of the pericha^tial leaves is a very marked character. 



5. Tortula revoluta, Brid. [Revolute Screw Moss.) 

 Stems short ; leaves lanceolate, acute, their margins remark- 

 ably revolute, those of the perichsetium sheathing, involute ; 



