491. H. (Amblystegium) riparium. Dill. St. longer, creeping, with sub-pinnate sub-erect branches; l. spreading, sub-complanate, ovate-lanceolate entire, nerved two-thirds or more; caps. oblong-cylindrical curved, cernuous, contracted at mouth when dry; lid conical pointed.
Stones, &c., near pools, sometimes in water. V. VI.
Sub-genus XII. eu-Hypnum. St. erect or procumbent, sometimes radiculose and pinnate; l. patent, squarrose, or falcato-secund, nerve various or none; areolæ narrowly linear,, often dilated, and transparent at base; caps. incurved cernuous on a smooth seta; lid convexo-conical, mammillate, rarely rostrate; perist. perfect.
Sect. I. Branches straggling or sub-pinnate; l. squarrose-divaricate or stellate and patent.
a. Monoicous.
492. H. Halleki. L. Jun. St. creeping, with pinnate erect branches; l. crowded lanceolate, recurved from a roundish ovate base, acuminate, serrulate, almost squarrose, faintly two-nerved at base or nerveless; caps. oblong curved cernuous; lid conical, blunt.
Alpine rocks, rare. VIII.
493. H. polymorphum. Hedw. “St. procumbent, branches simple, erect, slender; l. spreading, almost squarrose, sub-secund, ovate-lanceolate, acuminate, entire, nerveless; caps. oblong, curved, cernuous, lid conical.” [Bry. Brit.]
Limestone walls, banks and rocks. V.