Orthotrichum.'] D I P L O P E R I S T O M I. 



* * Peristome double. 



4*. O. qffine ; stems erect, leaves erecto-patent flaccid broadly 

 lanceolate, capsule deeply furrowed, teeth of the peristome 

 eight geminate, cilise filiform, calyptra slightly hairy. (TAB. 

 XXI.) 



. majus ; stems elongated ; calyptra, especially above, pilose. 



Orthotrichum affine. Schrad. Spicil p. 67. Smith, Fl. Brit. p. 

 1263. Engl Bot. t. 1323. Turn. Muse. Hib. p. 96. Schwaegr. 

 Suppl. v. 1. JP. II. t. 49. (under the name of O. striatum.} Moug. et 

 Nestl. n. 323. Sturm, Deutschl. Fl.Funck, Deutschl. Moose, n. 23. /. 

 5. Hobson, Brit. Mosses, v. 2. n. 45. Hook. Fl. Scot. P. II. p. 137. 

 Hook, and Grev. in Edin. Journ. of Science, v. 1. p. 121. Am. Disp. 

 Muse. p. 17. Dill. Muse. t. 55. f. 10. 



Orthotrichum heterophyllum. Beauv. (Etheog. p. 80. ? 

 /3. pumilum / stems very short ; calyptra glabrous. 



Orthotrichum pumilum. Swartz, Muse. Suec. t. 4. /. 9. Smith, Fl. 

 Brit. p. 1264. Engl Bot. t. 2168. Turn. Muse. Hib. p. 98. Schwaegr. 

 Suppl. v. 1. P. II. t. 50. Moug. et Nestl. n. 322. Sturm, Deutschl. 

 Fl.Funck, Deutschl Moose, t. 23. n. 8. Brid. Meth. p. 110. 



HAB. Trunks of trees and old pales, common. 

 We are by no means able to distinguish this species from O. 

 pumilum, of which the only characters are the smaller size and 

 entirely glabrous calyptra. Mr. Arnott considers the O. 

 Roger 7, Schwaegr. Suppl. v. 1. P. II. p. 16. t. 53. to be only 

 an obtuse-leaved variety of this plant. 



5. O. rupincola; stems erect or procumbent, leaves suberect 

 straight rigid broadly lanceolate, capsule furrowed above, 

 teeth 16 patent, calyptra very hairy. ( SUPPL. TAB. IV.) 



Orthotrichum rupincola. Funck, Deutschl. Moose, t. 35. f. 23. 

 Grev. Scot. Crypt. Fl. t. 105. Hook, and Grev. in Edin. Journ. of 

 Science, v. 1. p. 122. Drummond, Muse. Scot. v. I. n. 57. 



HAB. Rocks and stones, common; rarely upon trees, 



Scotland. 



The characters of this moss were first discovered in this coun- 

 try by our friend, Mr. M. J. Stark of Glasgow. Besides its singu- 

 larly rigid habit, and much larger and more luxuriant mode of 

 growth, it may be discriminated from O. qffine by its broader 

 capsule, by the inner peristome being extremely deciduous, the 



