182 SYNOPSIS OP BRITISH MOSSES. 



In slow flowing streams. 



Var. y. GRACILIS, Lindb. More slender. L. smaller, 

 narrower, acute, less acutely keeledj cells narrower, 

 often bifid on the keel, margin less reflexed. 



Colder streams. 



Malham Cove; Scotland. 



418. F. squamosa, Z. St. shorter, but elongate. 

 Br. numerous, crowded, fasciculate, not spreading. 

 L. lanceolate or oblong-lanceolate, concave, not keeled, 

 margin not reflexed, nerveless, entire. Caps, similar 

 to last. 



Mountain rivulets. June, July. 



Fam. 3. Diohelymese. 

 88. DICHELYMA, Myrin. 



419. [D.capillaceum,Diffo.J St. 3 — 6 inches, slender, 

 brittle, with a few distichous, spreading branches. L. 

 erecto-patent, secund, subulate-setaceous, keeled, with 

 a long, excurrent nerve ; per. 1. long, convolute, nerve- 

 less. Caps, short, oval, almost immersed, lid large, 

 conical, beaked. 



Alpine rivulets. Summer. 



A doubtful native. 



Tribe xxiv. Cetpheace*, 



Fam. 1. HedwigisB. 



89. HEDWIGIA, Mr. 



420. H. ciliata. Bides. 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. 1. with 



