OETHOTEIOHITM. 135 



haiiy, shining. Perist. teeth simple, 16 equidistant^ 

 erect when dry, slightly incurved. [Bry.Eur.,iii.t, 109.] 



Trap rocks. Summer. 



Scotland, Ireland (Dr. Wood). 



267. 0. Shawii, Wils. MS. Eesembles the last, but 

 differs by its leaves being less solid and of looser 

 texture at base, upper cells in one stratum always (not 

 in two), by the fewer hairs on its shorter glossy white 

 calyptra, and by its perist. teeth, densely papillose, 

 white and reflexed when dry. [Supp. Bry. Bur., fasc. 

 i. ii. Sch. Syn., 314.J 



On an ash tree at Kilkerran Castle, Argyleshire, 

 I860 (J. Shaw). ' June. 



2. Perist. double. 



268. 0. rupestre, Schl. St. 1 inch or more, caespitose, 

 creeping at base. L. broadly lanceolate, spreading, 

 slightly recurved. Caps, pyriform, mouth large, 

 scarcely exserted, indistinctly 8-striate. Calyptra 

 large, yellow, with long hairs. Perist. 16 pale teeth 

 in pairs (equidistant when dry), and 8 cilia. 



Mountainous rocks. July? August. 



c. Obtusifoliw. 

 L. obtuse, margin incurved, imbi-icate when dry. 

 Caps, immersed, striate. 



269. 0. obtusifolium, Schrad. In loose, yellowish- 

 green tufts, brownish below. L. patulous, oblong, 

 from an ovate base, apex obtuse, hyaline and tninutely 

 serrulate, concave, margin incurved, papillose at back ; 

 per. 1. broader and less obtuse. Caps, oval, immersed, 

 with 8 orange stris. Calyptra long, naked, whitish, 

 with a brown tip, lid convex, acuminate. Perist. teeth 

 8. bigeminate, reflexed when dry, alternating with 8 

 cilia. Dioieous. (Bry. Eur., iii. t. 208.) 



