507. H. COMMUTATUM. Dill. St. 4in. or more, procumbent; br. about ½in.—both more or less uncinate; radicles brownish; l. circinnate, secund, tapering to a slender long point from an ovate base, plicate, twisted when dry, finely serrulate, nerved more than half way, areolæ narrow; caps. large oblong, lid conical: dioicous.
508. H. SULCATUM. Schpr. Loosely cæspitose; st. rigid, without radicles, sub-pinnate; l. partly broadly elongate-lanceolate, partly sharply lanceolate from broadly ovate base, all reflexed hamulose; nerve strong. [Schp. Syn. 699.]
Mountainous places. Ben Lawers, July, 1865 (G. E. Hunt.)
509. H. FALCATUM. Brid. (_H. commutatum_ var. _condensatum_, Bry. Brit.) St. 2–3in. cæspitose, erect, sparingly branched; l. as in _commutatum_, but less circinnate and more rigid, undulate, nerved nearly to apex; capsule small, curved cernuous. [Bry. Eur. VI., 607. Schp. Syn., 613.]
510. H. FILICINUM. Dill. St. 2–4in. sub-erect, slender, pinnate, with purplish radicles; l. spreading, falcato-secund, st. l. deltoid-ovate, tapering; br. l. ovate-lanceolate—all serrulate, scarcely twisted when dry, nerved to or beyond apex; areolæ oval, rather large, larger rhomboid and pellucid at base; caps. oblong curved, cernuous, lid conical acute: dioicous.
var. β. _vallisclausæ._ Brid. l. sub-secund, nerve very strong and excurrent. Ormeshead; Derbyshire.
_Sect. IV._ St. robust, without radicles, irregularly pinnate; l. scariose, shining, strongly rugose; areolæ vermicular above, the rest small quadrate; caps. sub-arcuate, lid rostrate, annulus broad.
511. H. RUGOSUM. Dill. St. 2–3in. rigid, erect, densely tufted; br. recurved; l. crowded, falcato-secund, serrulate and recurved at margin, lanceolate acuminate from a broad base, rugose at back, nerved more than half way; caps. sub-cylindrical curved, pale reddish brown; lid large yellowish, with an oblique beak: dioicous.
Limestone and other rocks; barren in England. Spring (?)
_Sect. V._ St. creeping, cæspitose, pinnate, l. curved secund, areolæ loosely rhomboid; caps. incurved cernuous, compressed below mouth when dry.
512. H. INCURVATUM. Brid. St. short slender, branches curved upwards; l. ovate-lanceolate, tapering, all pointing upwards, entire, shortly two-nerved; caps. small, ovate, horizontal; lid short, conical, acute: monoicous.