254. O. CALVESCENS. Wils. Differs from _Bruchii_ by its shorter leaves more narrowly reticulated; calyp. scarcely hairy; caps. with a long tapering neck, lid more convex and shortly beaked; from _crispum_ by its longer seta and shorter caps. not contracted at mouth when dry, and by its smooth glossy calyptra. Trees. VI. Killarney (Dr. Moore and Dr. Carrington); Dailly and Loch Doon (J. Shaw). 255. O. BRUCHII. Brid. St. short tufted; l. spreading sharply linear-lanceolate from an ovate base, contorted when dry, sometimes wavy; caps. pyriform on a long seta, with eight broad striæ, and contracted at mouth when dry; calyp. blackish yellow, with many furrows and very hairy; perist. of 16 teeth in pairs, and eight, very seldom 16, cilia. Trees. Scotland, Yorkshire, Westmoreland, &c. VII. VIII. 256. O. DRUMMONDII. H. & G. St. longer, creeping, l. linear-lanceolate from a narrow ovate base, blunt-pointed, scarcely crisped, margin hardly recurved; caps. oblong-pyriform, deeply striate, and contracted at mouth when dry, on a long seta; calyp. with long stiff hairs; perist. of 16 teeth in pairs, and no cilia. Trunks of young trees. S. I. E. VIII. 257. O. HUTCHINSIÆ. Sm. St. about ½in. tufted; l. erecto-patent broadly lanceolate, nerved to blunt apex, margin scarcely reflexed; caps. clavate-pyriform, with eight broad striæ, slightly contracted at mouth when dry; apophysis tapering; calyp. large, very hairy. Perist. 16 teeth in pairs, and eight short cilia, sometimes wanting. Mountainous rocks. W. I. S. E. VII. 258. O. PHYLLANTHUM. B. & S. St. 1in. tufted; l. linear-lanceolate without a broad base, nerve extending to apex or exserted, where it is generally covered with gemmæ, crisped when dry; fruit not known. Rocks and trees, generally near the sea. 37. ZYGODON. HOOK. & T. A. Peristome absent. 1. Caps. on a short seta. 259. Z. LAPPONICUS. B. & S. St. ½in. cæspitose radiculose; l. spreading, linear-lanceolate keeled, contorted when dry, nerve ceasing near apex; per. l. ovate-lanceolate; caps. scarcely exserted turbinate, deeply eight-striate, urceolate when dry; lid with a short oblique beak: monoicous. Crevices of alpine rocks. S. W. Summer. 260. Z. MOUGEOTTII. B. & S. St. more than 1 inch cæspitose, scarcely radiculose; l. fasciculate recurved, narrowly linear-lanceolate, margin reflexed below, nerved to apex, not contorted when dry; caps. turbinate urceolate when dry, eight-striate; lid with a long very oblique beak: dioicous. Moist shady rocks. Summer. 2. Caps. on a longer seta. 261. Z. VIRIDISSIMUS. Brid. St. ½–1in., fastigiate, radiculose below; l. much spreading recurved, widely lanceolate, somewhat contorted when dry, nerve sometimes slightly excurrent; caps. obovate obscurely eight-striate; lid with a long oblique beak: dioicous. Trees and rocks. III. IV. B. Peristome present.