Didymodon.} MUSC1-ACR0CARPI-PERIST0MI. 29 



flexuose strongly serrated at the point the margin recurved be- 

 low, capsule erect cylindrical, lid rostrate. Muse. Brit. ed. 1. 

 p. 66. ed. 2. p. 115. t. 20. Drum. Muse. Scot. v. 2. n. 46.— 

 Trichostomum flexifolium, Fl. Brit. p. 1246. E. Bot. t. 2490.— 

 Bryum flexifolium, Dicks. Cr. Fasc. 3. t. 7. 



On sterile banks, moors, thatched roofs, and where heath has been 

 burned ; not unfrequent. Fr. Spring. — A very distinct and well-marked 

 British moss, always of a pale yellow-green colour. The D. squarrosus 

 from Nepal almost exactly resembles this, except in being thrice 

 its size. 



5. D. glaucescens, Web. et Mohr, {glaucous Didymodon); 

 stems rather short densely tufted slightly branched, leaves 

 linear-lanceolate erecto-patent acute remarkably glaucous, cap- 

 sule oblong erect, lid conico-rostrate. Fl. Cr. Germ. p. 158. 

 Grev. Scot. Cr. Fl. t. 127. Muse. Brit. ed. 2. p. 116. Suppl. 

 t. 3. — Trichostomum glaucescens, Hedw. St. Cr. v. 3. t. 37. 

 Fl Brit. p. 1245. E. Bot. t. 2381. 



Scottish mountains, very rare. Glen of the Dole, Clova, on rocks 

 slightly covered with earth. Fr. Aug. — Distinguished at once by its 

 glaucous-green hue. The peristome is long, red, consisting of 32 filiform 

 teeth, placed in pairs. 



6. D. Brwitoni, Am. (Mr. Bruntons Didymodon); stems 

 elongated pulvinate branched, leaves lanceolato-subulate the 

 margins slightly recurved scarcely serrated twisted when dry, 

 capsule erect ovate, lid obliquely rostrate. Am. Disp. Muse. 

 p. 36. Muse. Brit. ed. 2. p. 117. Suppl. t. 4. — D. obscurus, 

 Kaulf.—Schwaegr. Suppl. v. 2. p. 80. t. 125. Grev. Scot. Cr. 

 Fl. t. 193. — Dicranum Bruntoni, E. Bot. t. 2509. — D. poly- 

 carpon, Muse. Brit. ed. 1. p. 57. Drum. Muse. Scot. v. 2. n. 37. 

 I Rocks, in alpine districts. Fr. June. — This has very much the habit 

 of Wcissia crispula ; but the peristome is truly that of a Didymodon. It 

 has been well illustrated in the beautiful Scottish Cr. Flora, by Dr. 

 Greville, who finds it abundantly on the Pentland hills, as Mr. IT. 

 Wilson does at Aber, N. Wales. The latter observes a slight appearance 

 of a struma at the bottom of the capsule. 



7. D. rigid ulus, Hedw. (rigid-leaved Didymodon); >teni> 

 elongated branched, leaves lanceolate carinate tapering up- 

 wards to a narrow point the margins reflexed entire, nerve 

 rigid running beyond the point, eapMile oblongo-ovate erect, 



lid rostrate. WUs Hedw. St. Cr. r. :). t. 4. Muse. /int. ed. 2. 



j>. 1 17.^.20. — Trichostomum rigidulunh Fl. Brit />. L238. E. lint. 

 fc2178. Turn. Mute, ffib.p. .)\.— T. Uneare, FLBritp. L240? 

 E. Bot. t. 159s. — Bryum Uneare cud D. rioidulum, Dicks. 



Walls and rocks. Fr. Sept. to March. — Mr. Turner well observe- 



that the foliage ofthia moss much resemble! that of TorhtlafaUax: but 

 the nerve i> different, singularly rigid, of a brown colour (as well as tin- 

 leaves themselves), ami aecidedlv running out beyond the point o\ the 

 leaf: thus the sterna have a bnstrj appearance from the ituthess and 

 Bharpnesa of the foliage. Near Beaumaru Mr. Wilson baa observed 

 a var. with a cylindrical capsule. 



