HTPNUM. 227 



crowdedj curved, cuspidate and convolute at apex. L. 

 generally secund, sometimes almost falcate, ovate lanceo- 

 late, entire, strongly concave, pointed, either nerveless, 

 shortly 2-nerved or singly nerved half way; per. 1. 

 erect, distinctly striate. Caps, ovate or oblong, cylin- 

 dric, slightly curved, cernuous, lid conical, pointed. 



Stones and rocks in streams. May. 



Var. yS. L. imbricate, not secund. 



Var. 7. STTBSPHCEEiCAEPON. L. stronglynervcd nearly 

 to apex. Caps, roundish ovate, tumid. 



556. H. moUe, 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, 

 areolas larger and wider than in last, nerve rather long 

 and thick, ill-defined, single or double. Caps, turgid, 

 oval, incurved, cernuous, lid convex, mamillate. 



Great elevations. August. 



Ben-mac-Dhui, Ben Nevis. 



556. H. dilatatum, TF&. (ST. moZZe, Bry. Eur.). Plant 

 of somewhat firm growth. L. rotundo-ovate, narrowly 

 decurrent, at apex faintly serrate, rather concave, 

 suddenly apiculate, texture very close, areolae long 

 and very narrow, slightly dilated at angles, hexagono- 

 rectangular, nerve double, short, slender, but well 

 defined. Caps, ovate, cernuous, curved, lid conical. 



At a low elevation. 



North Wales, Yorkshire, Berkshire, Clova, Braemar. 



657. H. arcticum, Sommerfelt. St. 1 — 2 inches, 

 creeping, eradiculose. Br. elongate, simple, obtuse. 

 L. spreading, green above, purplish below, small. 



