126 DIPLOPERISTOML [ Orthotrichum. 



f f Capsule exserted. 



2. O. anomalum ; stems erect, leaves ovato-lanceolate erecto-pa- 



tent straight when dry, teeth eight geminate, calyptra slightly 

 hairy. (TAB. XXI.) 



Orthotrichum anomalum. Hedw. St. Cr. v. 2. t. 37. Turn. Muse. 

 Hib. p. 94. Schwaegr. Suppl. v. 1. P. II. p. 37. Sturm, Deutschl 

 Fl. v. 4. t. 13. Moug. et Nestl. n. 29. Dicks. Crypt. Fasc. 4. p. 6. 

 Drummond, Muse. Scot. v. 2. n. 50. Hobson, Brit. Mosses, v. 2. n. 43. 

 Hook. Fl. Scot. P. II. p. 137. Hook, and Grev. in Edin. Journ. of 

 Science, v. 1. p. 119. Am. Disp. Muse. p. 13. 

 Orthotrichum saxatile. Brid. Meth. p. 1 10. 



Bryum striatum. 0. Linn. Sp. Pip. 1580 Dill. Muse. t. 55. / 9. 

 HAB. Upon rocks and walls. 



Stems scarcely an inch in height; leaves when dry, tawny 

 brown. Teeth of the peristome arched when moist, inclined or 

 erect (never recurved) when dry. Hedwig, if we may judge 

 from his representation of the peristome, confounded this plant 

 with O. cupulatum ; but we see no reason for altering its 

 name, as Bridel has done, to O. saxatile. 



3. O. Drummondii; stems creeping, leaves narrow-lanceolate 



crisped when dry, capsule elongato-clavate deeply furrowed, 

 calyptra very hairy. ( SUPPL. TAB. IV.) 



Orthotrichum Drummondii. Hook, in Grev. Crypt. Fl. t. 115. 

 Drummond, Muse. Scot. v. 1. n. 69. Hook, and Grev. in Edin. Journ. 

 of Science, v. 1. p. 120. 



HAB. On the trunks of young trees, especially Birches, 

 Scotland. First discovered by Mr. Drummond 1 , and 

 since found to be abundant in the alpine glens through- 

 out the west of Scotland. 



A beautiful species, in habit much resembling specimens of 

 O. crispum, but differing, even at first sight, by having the 

 branches in the circumference of the tufts decidedly creeping, 

 and essentially distinct by its single peristome. This peristome 

 is large in proportion to the diameter of the capsule, of an al- 

 most pure white, composed of 16 teeth distinct at the base, but 

 united in pairs at the extremity, spreading horizontally, or 

 slightly deflexed. These pairs of teeth, being inserted in the 

 furrows, their bases project so far into the mouth of the capsule 

 as to give it a remarkably angular, or even stellated, appearance. 



