Tortula.-} AP L O PER I ST O M I. 61 



growing in dry fields, would scarcely be believed to be the 

 same as those luxuriant specimens found on the moist banks of 

 rivers. In the former situation, when about half an inch, or 

 somewhat more, in height, it agrees with the T. unguiculata 

 of Smith; when an inch and upwards, it becomes T. fallax, and 

 when nearly two or three inches, it is the Bryum linoides of 

 Dickson. In the leaves, too, there is some difference, being in 

 the last mentioned variety longer and sharper than in the 

 others. The direction of the leaves is usually recurvo-patent. 

 The T. imberbis of Smith, agrees with the most usual ap- 

 pearance of T. fallax. 



We scarcely know to what the var. f3. and y. of Schultz 

 properly belong ; like our var. (3. of T. gracilis, they appear to 

 be intermediate between T. gracilis and T. fallax, and all might 

 with propriety come under the latter and older species. 

 14. T. gracilis; stem elongated somewhat branched, leaves lan- 

 ceolato-acuminate erect rigid when dry very straight the 

 margin recurved, capsule oblongo-ovate, lid rostrate very 

 short. (SUPPL. TAB. II.) 



Tortula gracilis. Hook, and Grev. on Tort. p. 300. Arn. Disp. Muse. 

 p. 39. 



Barbula gracilis. Schwaegr. Suppl. p. 125. t. 34. Schultz, in Nov. 

 Act. Acad. Cces. v. 11. p. 198. t. 32. f. 3. 



ft. viridis ; stems and leaves somewhat wider, the latter a little patent. 

 T. brevifolia. Smith, Fl. Brit. p. 1259. Engl. Bot. t. 2453. 

 Barbula brevifolia. Brid. Meth. p. 92. 



HAB. a. Scotland. Mr. Dickson and Mr. Drummond. 

 $. Durham and Northumberland. Mr. Winch. Near 

 Cork. Mr. Drummond. 



Very closely allied to T. fallax, but a smaller and slenderer 

 plant; its leaves are far more rigid, more erect, and very 

 straight, when dry quite appressed to the stem. Colour brown- 

 ish in a. ; green in /?., which latter appearance is so like to T. 

 fallax, that we have hesitated to which of the two species to 

 refer it. Mr. Arnott, indeed, has observed to us that the T. 

 gracilis is not distinct from T. fallax ; and, moreover, that it 

 is not uncommon in Scotland. 



