Tortula.-} A P L O P E R I S T O M I. 53 



Tortula enervis. Hook, et Grev. L c. p. 288. Am. Disp. Muse. p. 

 37. 



T. rigida. Smith, Fl. Brit. p. 1249. 9 Engl. Bot. t. 180. Schwaegr. 

 Suppl v. I. p. 118. Brid. Meth. p. 88. 



Barbula rigida. Hedw. Sp. Cr. v. 1. p. 65. t. 25. Moug. et JVestl. 

 n. 614. Schultz in Nov. Act. Cces. v. 11. p. 196. t. 32. 



Bryum stellatum. Schreb. FL Lips. p. 80. ? 



HAB. Walls and clay banks. Near Yarmouth. 



2. T. brevirostris ; stem very short, leaves few rotundato-ellipti- 



cal very obtuse concave nerveless rigid, the margins involute, 



lid conical scarcely beaked half the length of the oblong 



capsule. (SUPPL. TAB. II.) 



Tortula brevirostris. Hook, et Grev. I. c. p. 289. t. 11. Am. Disp. 



Muse. p. 37. Hook. FL Scot. ed. 2. diss. 

 T. rigida. Funck, Deutschl. Moose, p. 15. 

 HAB. On an old wall near Edinburgh. D. Stewart, Esq. 



We find this Tortula alluded to by Turner and Smith, under 

 their descriptions of T. rigida, as having a short operculum, 

 Besides this character in the operculum as distinguishing it 

 from T. enervis, the leaves are invariably shorter and broader 

 than in that species, and the peristome is only half the length. 

 The different form of the leaves of these two species, and their 

 being destitute of nerve, essentially characterize them, as dis- 

 tinct from the true T. rigida, with which so many authors have 

 confounded them. 



B. Leaves rigid, nerved. 



3. T. rigida; stem very short, leaves few linear incurved sub- 



mucronulate grooved nerved rigid, the margins involute, lid 

 rostrate about half the length of the oblong capsule. (TAB. 

 XII.) 



Tortula rigida. Turn. Muse. Hib. p. 43. Hook, et Grev. 1. c. p. 

 289. Am. Disp. Muse. p. 37. Hobson, Brit. Mosses, v. 1. n. 21. 



Trichostomum aloides. Koch, in litt. (fide Moug. et Nestl.J Moug. 

 et Nestl. n. 111. 



Bryum rigidum. Huds. Angl p. 477 Dill. Muse. t. 49. / 55. 

 HAB. Near Yarmouth, and at Henfield in England. Upon 



clay banks. 



The peristome of this Moss is shorter than that of most 

 D3 



