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 a. Monoicous.

524. Dill. St. creeping; br. ascending, crowded, curved, cuspidate and convolute at apex; l. generally secund, sometimes almost falcate, elliptic-entire, strongly concave, pointed; either nerveless, shortly two-nerved or singly nerved half way; per. l. erect, distinctly striate; caps. ovate, slightly curved; cernuous; lid conical, pointed.

Stones and rocks in streams.

var. β. l. imbricate, not secund.

γ. subsphœricarpon. l. strongly nerved nearly to apex; caps. roundish ovate, tumid.

525. Wils. (H. molle, Bry. Eur.) Plant of somewhat firm growth; l. rotundo-ovate, rather concave, suddenly apiculate, texture very close, areolæ long and very narrow; nerve double, short slender, but well defined (fide G. E. Hunt). Caps. ovate cernuous curved, lid conical.

At a low elevation. N. Wales, Yorkshire, Berkshire, Clova, Braemar.

526., Dicks. (H. alpestre (?) Bry. Eur., non Swartz.) Very weak and flaccid, the tufts falling to pieces on removal from the water; l. varying from ovate to rotundo-ovate, flat, or sometimes very slightly reflexed towards apex, gradually tapering upwards, or very rarely suddenly apiculate; texture somewhat loose, areolæ larger and wider than in last; nerve rather long and thick, ill-defined, single or double (fide G. E. Hunt). Caps. as above.

Great elevations. Ben-mac-Dhui, Ben Nevis.

[The above two diagnoses are from a paper by Mr. G. E. Hunt, on Perthshire and Braemar Mosses in Trans. Lit. and Phil. Soc. and Manchester, 1868-9, p. 320.]