_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 two-nerved, shining; areolæ linear; caps. incurved cernuous; lid mammillate or convexo-conical. 1. St. more or less regularly pinnate; l. patent or loosely imbricate. _a._ Monoicous. 530. H. CORDIFOLIUM. Swartz. Bright green above, reddish brown below; st. 3–6in. erect, sub-pinnate; br. short slender; l. spreading, almost squarrose, convolute and cuspidate at tip of branches, distant, cordate-ovate, obtuse, or slightly apiculate, concave entire, strongly nerved almost to apex; cells scarcely enlarged at base; caps. oblong, suddenly horizontal, not tapering at base; lid conical. Marshes and ditches. IV. V. _b._ Dioicous. 531. H. GIGANTEUM. Schp. St. erect, thick, often 1ft. long, densely pinnate; st. l. patent, broadly cordate-ovate, strongly nerved to apex; cells linear, excavate and quadrate at basal angles; br. l. lingulate narrow, terminal ones twisted and subulate; per. l. oblong-lanceolate; caps. oblong-cylindrical, sub-incurved, horizontal, on a long seta; annulus none; lid mammillate. [Schp. Syn. 642.] Marshes. Hale Moss and Wybunbury Bog. Summer. 532. H. SARMENTOSUM. Wahl. St. 1in. or more, procumbent, sub-pinnate; br. short cuspidate; foliage red or purplish; l. much crowded, sub-erect, elliptic-oblong, scarcely pointed, concave, entire, nerved almost to apex; areolæ large, quadrate and pellucid at basal angles; caps. ovate-oblong, cernuous. Wet alpine rocks. Spring (?) 533. H. CUSPIDATUM. Dill. St. 2–6in. erect, pinnate; terminal foliage cuspidate; l. spreading, almost squarrose, when young erect appressed and convolute; ovate, obtuse, entire, nerveless or shortly two-nerved; cells enlarged and pellucid at basal angles; caps. oblong, much curved, tapering below; lid conical acute. Marshes. V. VI. 534. H. SCHREBERI. Dill. St. 4–6in. erect, pinnate, deep red, with slender curved branches, somewhat cuspidate at summit; l. convolute, afterwards erecto-patent, elliptical, concave, obtuse, shortly two-nerved; cells enlarged at basal angles; caps. ovate-oblong curved cernuous; lid conical, pointed. Woods and shady banks. X. XI. 535. H. PURUM. Dill. St. 4–6in., not coloured, erect, pinnate; br. slightly curved, not cuspidate at apex; l. closely imbricate, broadly elliptical, concave, with recurved points, almost boat-shaped, entire, nerved half way; caps. ovate, suddenly horizontal; lid conical. Shady banks. X. XI. 2. St. almost simple, or sparingly branched; l. closely imbricate when dry: dioicous.