13G ACOTYLEDONs. — Musci. Orthotrichufu. 



Hab. Walls and rocks. Angiis-shire, G. Don. 



5. D. trifarium, leaves rather distant somewhat trifarious lanceo- 

 late rather obtuse carinated with the nerve scarcely reaching 

 to the point, capsule oblongo-ovate erect, lid rostrate. Muse. 

 Brit. p. 67. /. 20. 



Hab. Moist banks. Ravines of Lorn, Capt. Carmichael. Pentlands 

 and coast of Fife, Mr. Greville. Highlands, G. Don. 



6. D. capillaceum, steins elongated, leaves nearly distichous su- 

 bulato-setaceous, capsule erect ovato-cylindraceous,lid conical. 

 Muse, Brit. p. 67. t.20. 



Hab. Banks and rocks in mountainous situations. 



7. D. heteromallum, stems rather short, leaves subsecund subu- 

 late, "capsule ovato-cylindraceous, lid conical. Muse. Brit, 

 p. 68. t. 20. 



Hab. Pentland hills and Fifeshire coast, Mr. Greville. Kinross -shire. 

 Loch Earne^ &c. Mr. Arnott. 



b. Peristome double. 

 21. FUiNARIA. 

 Fruitstalks terminal. Peristome double oblique; the outer of 16 

 teeth, the inner of 16 teeth opposite to those of the outer. 

 Muse. Brit. p. 69. t. 2. 



1. F. hygrometriea, leaves very concave ovate apiculate entire, 

 nerve excurrent, fruitstalk curved flexuose. Muse. Brit, 

 p. 69. t. 20. 



Hab. Old walls and buildings, and dry and barren soils in almost 

 every situation. 



2. F. Muldenbergii, stems short, leaves concave ovate suddenly 

 acuminated serrated, nerve disappearing below the point, fruit- 

 stalks straight. Muse. Brit. p. 69. t. 20. 



Hab. Among rocks, principally calcareous. Rocks of Lismore, not 

 rare, Capt. Carmichael. 



22. Z\'GODON. 



Fruitstalks terminal, Peristorne double; the ex^ of 16 teeth 

 approaching in pairs, the i?it. of as many horizontal ciliary pro- 

 cesses. Calyptrd dimidiate, glabrous. Muse. Brit. p. 70. ^3. 



1. Z. eonoideum, Muse. Brit. p. 7^. t. 21. 



Hab. Rare. Trunks of trees, near Inverary. Ash trees and hazel 

 bushes. Lorn, Capt. Carmichael. 



Tufted. Leaves erecto-patent, ovate and lanceolate, dotted, entire; the 

 nerve reaching to the point. Capsule ovate, erect, with a slight apo- 

 phvsis, furrowed. 



23. ORTHOTRICHUM. 



Fruitstalks terminal. Peristome double; the ext.of 16 teeth ap- 

 proaching in pairs, the i?i?ier (usually) of as many ciliary pro- 

 cesses lying horizontally. Calyptr'a mitriform, sulcate,' more 

 or less hairy. Muse, Brit. p. 72. /. 2. 



