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 b. Dioicous: perist. double.

189. Hedw. St. 1-2in. radiculose; l. sub-erect, ligulate, obtuse and cucullate at apex, nerve not excurrent; per. l. lanceolate-subulate from an ovate base; caps. oblong narrowed above, spirally striate, and twisted when dry; perist. outer teeth filiform, inner cilia; calyp. toothed or fringed at base, and roughened at apex.

Limestone and mortared walls; rare in fr.

30. HEDWIGIA. Ehr.

190. Hedw. Monoicous; dichotomously branched, rooting at base only; l. crowded, spreading, sometimes secund, ovate-lanceolate, concave, margin recurved below, apex diaphanous, prolonged to a blunt point and strongly toothed on each side; per. l. with apex laciniate; caps. immersed globose; lid convex with a short beak; calyp. conical, sometimes hairy.

Rocks in mountainous districts. N. Wales, Arthur's Seat, &c.

Bry. Brit, gives as varieties—

β. leucophæa. l. more crowded and spreading, wider and with longer diaphanous points.

γ. secunda. procumbent slender; l. more distant, secund, sub-muticous.

δ. viridis. l. scarcely secund; spreading, deep green, scarcely diaphanous at apex.

ε. striata. l. plicate much recurved; lid conical.