ε. _lacunosum._ more robust; br. thickened; l. larger sub-coriaceous, yellowish brown. ζ. _longisetum._ slender, l. pale, serrulate; seta elongate, caps. short ovate. θ. _mammillatum._ caps. with a short conical or mammillate lid. 519. H. RESUPINATUM. Wils. St. creeping, sub-pinnate; l. erecto-patent, secund, pointing upwards, ovate-lanceolate, tapering to a point, entire, nerveless; caps. oblong erect, almost symmetrical; lid with an oblique beak. Walls, rocks, trees, &c. X. XII. 520. H. LINDBERGH. Mitt. Jour, of Bot. I., p. 123. (_H. pratense_, Bry. Brit. 399.) “St. sparingly branched in an irregular manner, without any appearance of becoming pinnate; l. loosely compressed ovate or ovate-lanceolate, acute, but with a broad point,[2] margins entire, nerveless; cells at angles enlarged and pale; caps., according to Lindberg, is on a rather thick seta 1in. long, turgid ovate, when dry plicate.” Footnote 2: Some of the leaves, even on authenticated specimens, have longer and narrower points (acuminate), but in no case that I have seen are they denticulate. “Damp sandy ground among thin grass, not in bogs. The fr. has been gathered once by Dr. Klingraff in June, in W. Prussia.” “_H. pratense_ differs from above in its irregularly pinnate stems, more compressed foliage, l. lanceolate with a narrow point denticulate at apex, and the enlarged basal cells of same colour; not found in Britain.” 521. H. ARCUATUM. Lindb. (_H. pratense_, var. β. Bry. Brit.) “L. more falcato-secund, scarcely complanate.” Clay soils, common. _Sect. VII._ Prostrate or ascending, rooting, regularly pinnate; l. hamate, circinnato-secund; caps. cernuous, solid, lid convexo-conical. 522. H. MOLLUSCUM. Dill. St. soft, 1–2in. sub-erect; l. circinnate secund; st. l. cordate; br. l. ovate-lanceolate—all tapering acuminate, striate, serrulate, and faintly two-nerved, crisped when dry; caps. ovate, horizontal; lid conical, large, sharply pointed. Moist banks and limestone rocks, common. XI. _Sect. VIII._ St. erect, rigid, villose, regularly pinnate; l. hamate; caps. oblong, incurved, solid. 523. H. CRISTA-CASTRENSIS. L. St. sub-erect, 3–4in. pectinate; st. l. ovate-acuminate, br. l. narrowly lanceolate acuminate, strongly striate, serrulate near apex—all circinnato-secund, faintly two-nerved, margin reflexed; caps. oblong curved, cernuous, lid conical, pointed; dioicous. Woods and alpine rocks. VII. VIII. _Sect. IX._ St. soft cæspitose, prostrate, branched; l. falcato-secund, rarely spreading, faintly nerved; areolæ linear; per. l. long, deeply sulcate; caps. incurved cernuous, lid convexo-conical or mammillate. _a._ Monoicous.