44 MUSCI-ACItOCARPI-PERJSTOMI. [Tortilla. 



rigid the margins involute, lid rostrate about half the length of 

 the oblong capsule. Turn. Muse. Bib. p. 43. Hobs. Br. Mosses, 

 v. 1. n. 21. Muse. Brit. ed. 2. p. 53. / 12. GW. £W. Or. Fl. 

 v. 6. *. 348. — Bnjum rigidum, Buds — Bill. Muse. p. 49./. 55. 



On clay-banks, in the South-East of England. Wall-top, near Dublin, 

 Brummond. Fr. Nov.— The peristome of this moss is shorter and less' 

 twisted than that of most other Tor t nice ; hence Mougeot and Nest- 

 ler have published it as a Tric/wstomum, and under the appropriate 

 specific name of T. aloides. 



** Leaves more or less membranous. 

 f Perichcetial leaves convolute, sheathing. 



4. T. convoluta, Sw. (convolute Screw-Moss); stems rather 

 short, leaves oblongo-lanceolate acute their margins plane those 

 of the perichsetium remarkably involute, capsule oblong, lid 

 rostrate. Sw. Muse. Suec. Fl. Brit. p. 1253. E. Bot. t. 

 2382. Turn. Muse. Bib. p. 149. Bobs. Br. Mosses, v. 2. n. 19. 

 Drum. Muse. Scot. v. 1. n. 23. Muse. Brit. ed. 2. p. 54. f. 12.— 

 Barbula convoluta, Hedw. St. Cr. v. I. p. 87. /. 32. Schwaegr. 

 Suppl. v. 1. p. 127.— Bnjum convolution, Dicks.— .Dill. Muse. 

 t. 48. f. 44. 



Banks and upon turf-walls; not uncommon in the north. Fr. 

 Spring.— Thereto are pale-coloured, like those of Didymodon pallidus] 

 the whole foliage is of a yellowish hue, and the perichcetial leaves are 

 strikingly convolute. 



5. T. revoluta, Brid. (revolute Screw-Moss); stems short, leaves 

 lanceolate acute their margins remarkably revolute those of the 

 perichsetium sheathing involute, capsule oblong, lid rostrate 

 shorter than the capsule. Brid. in Schrad. Journ. 1800. Drum. 



Muse. Scot. v. 2. n. 22. Muse. Brit. ed. 2. p. 54. t. 12. T. 



nervosa, E. Bot. t. 2383.— -Barbula revoluta, Mohr. Schwaegr. 

 Suppl. v. 1. p. 127. t. 32.— ;3. obtusifolia, Schwaegr. Suppl. v. 1. 



t. OL. 



Banks and sandy places. Fr. Spring. 



ff Leaves uniform. 



6. T. murdlis, Hedw. (wall Screw-3Ioss); stems mostly short, 

 leaves patent narrow oblong the margins recurved, the nerve 

 strong running out into a hair-like point, capsule oblongo-cylin- 

 drical, lid conical acuminate — «. vulgaris; leaves carinated 

 tipped with a long white hair-like point. T. muralis, Hedw. 

 Sp. Muse. p. 123. Turn. Muse. Hib. p. 50. Fl. Brit. p. 1257. 

 E. Bot. t. 2033. Hobs. Br. Mosses, v. 2. n. 16. Drum, Muse. 

 Scot. v. 2. n. 24. Muse. Brit. ed. 2. p. 55. t. 12.— Barbula 

 muralis, Mohr. Schwaegr. Suppl, v. I. p. 132.— Bryum mural*, 

 Linn.— Dill. Muse. t. 45. /. 14.—/3. brevipila ; leaves nearly 

 plane scarcely piliferous. Muse. Brit. ed. 2. p. 55.— Barbula 

 cestiva, Web. et Mohr, Cr. Germ, p. 207.— 8. cimeifolia, Funck, 

 Deutschl, Moose, L 15. f. 12. 



