54 MUSCl-ACROCARPI-PERISTOMI. [Orthotrichum, 



3. O. Drummondii, Hook, (Mr. DrummonaV s Bristle-moss); 

 stems creeping, leaves narrow-lanceolate crisped when dry, 

 capsule elongato-clavate deeply furrowed, calyptra very hairy. 

 Hook, in Grev. Scot. Cr. Fl. t. 115. Brum. Muse. Scot. v. 1. 

 n. 69. Muse. Brit. ed. 2. p. 126. Suppl. t. 4. 



Trunks of trees, especially Birches, in alpine glens in the West of 

 Scotland. On a Fir tree, on Turk Mountain, Killarney. Wits. First 

 discovered by Mr. Drummond. Fr. Aug. — A beautiful species, in some 

 respects resembling O. crispum, but differing, even at first sight, by 

 having the branches in the circumference of the tufts decidedly creeping; 

 and still further distinguished by its single peristome, which consists of 

 16, white teeth, distinct at the base, but united in pairs at the extremity, 

 spreading horizontally or slightly deflexed. 



** Peristome double. 



f Capsule immersed. 



4. O. affine, Schrad. (pale straight-leaved Bristle-moss); 

 stems erect, leaves erecto-patent flaccid broadly lanceolate, 

 capsule deeply furrowed, teeth of the peristome 8 geminate, 

 cilia filiform, calyptra slightly hairy. Muse. Brit. ed. 2. p. 127, 

 t. 21. — x. majus ; stems elongated, calyptra especially above 

 hairy. O. affine, Schrad. Spicil. p. 67. Fl. Brit. p. 263. E. 

 Bot. t. 1323. Turn. Muse. Hib. p. 96. Schwaegr. Suppl v. 1. 

 P. II. t. 49, (as O. striatum.) Hobs. Br. Mosses, v. 2. n. 45. — 

 Dill. Muse. t. 55. /. 10. — ,3. pumilum ; stems very short, 

 calyptra glabrous. O. pumilum, Sw. Muse. Suec. t. 4. f. 9. 

 Fl. Brit. p. 1264. E. Bot. t. 2168. Turn. Muse. Hib. p. 98. 

 Schwaegr. Suppl. v. 1. P. II. t. 50. 



Trunks of trees and old pales, common. Fr. Aug. 



5. O. rupincola, Funck, (Rock Bristle-moss); stems erect or 

 procumbent, leaves suberect straight rigid broadly lanceolate, 

 capsule furrowed above, teeth 16 patent, calyptra very hairy. 

 Funck, Deufschl. Moose, t. 35. /. 23. Grev. Scot. Cr. Fl. t. 105. 

 Drum. Muse. Scot. v. 1. n. 57. Muse. Brit. ed. 2. p. 127. Suppl. 

 t. 4. — O. striatum, "Davits Welch Bot." 



Rocks and stones, rarely upon trees, in alpine districts. Fr. June. — 

 This has a singularly rigid habit. It is more luxuriant than O. affine, 

 having a broader capsule, a very deciduous inner peristome while the 

 outer one is erect, never deflexed, and the cahjptra is more hairy. 



6. O. didphanum, Schrad. (diaphanous-pointed Bristle- 

 Moss); stems erect very short, leaves lanceolate acuminate 

 diaphanous at the points, calyptra slightlv hairy. Schrad. 

 Spicil. p. 69. Fl. Brit. p. 1265. E. Bot. t. 1324. Schwaegr. 

 Suppl. v.l.p.Zl.t. 55. Hobs. Br. Mosses, v. I. n. 55. Drum. 

 Muse. Scot. v. 1. n. 59.— 0. aristatum, Fl. Brit. p. 1265. Turn. 

 Muse. Hib. p. 100. t. 9. /. 2. 



Trees, walls and old pales, especially near the sea. Fr. Feb. — 

 Readily distinguished by the diaphanous points of the leaves. Teeth 16, 

 not approximated in pairs. 



