527. H. arcticum. Sommerfelt. St. 1-2in. creeping; br. elongate, simple, obtuse; l. spreading, green above, purplish below, small, broadly ovate or roundish, somewhat obtuse, entire, strongly two-nerved about half way, sometimes nerves blended into one; caps. ovate, cernuous, tapering into the seta; lid conical.
Alpine rivulets. VI.
528. H. eugyrium. Schpr. St. short, much branched; l. crowded, st. l. drooping on two sides, broadly oblong-lanceolate, shortly acuminate; br. l. flexuoso-falcate, plano-concave, elongate-lanceolate narrower, serrulate at apex; nerve thin, unequally bifid; areolæ vermicular excavate, fulvous, and rectangular at the decurrent angles; per. l., external spreading, internal erect, longly lanceolate, with erose apices; caps. ovate-oblong cernuous, turgid, lid mammillate; annulus broadly bi-triseriate. [Bry. Eur. VI., t. 579. Schp. Syn., 639.]
Stones in waterfalls. Summer.
N. Wales, Devonshire, Killarney.
b. Dioicous.
529. H. ochraceum. Turn. St. 2-4in., tufted filiform, sub-erect, sparingly branched; l. yellowish-green sub-secund, sometimes falcate, distant, ovate-lanceolate, pointed, concave, nerve forked, extending half way; per. l. squarrose recurved; caps. oblong, tapering at base, cernuous; lid conical.
Stones in alpine and sub-alpine streams, &c. V. VI.
Sect. X. Erect or procumbent, stem simple or more or less pinnate; l. patent, rarely sub-complanate, or sub-secund, thinly single-nerved, or shortly
