488 hypnacejE. 



flexuose, very slender, simple or with very few branches, terete, 

 soft and weak ; pale green or yellowish, 3-8 inches high. Leaves 

 rather close, more or less erect and imbricated, concave, 

 decurrent, f-i line long, ovate-oblong or oblong, widest near the 

 base, obtuse, rounded and sub-cucullate at summit, not 

 unfrequently producing tufts of brown radicles at apex, entire, 

 lightly plicate ; nerve single, slender, reaching to near the apex ; 

 cells widely linear or linear-rhomboid, thin-walled, 8-15 times as 

 long as wide, a small patch in the middle of the apex short, 

 rounded-quadrate ; wider at base, at angles suddenly much 

 enlarged, thin-walled, hyaline, forming very distinct, hyaline, 

 decurrent auricles. Seta very long, slender. Capsule oblong- 

 cylindric, curved, oblique, tapering at base ; annulus none. 

 Dioicous. 



Hab. Mountain bogs, and marshes, rare. Fr. very rare, summer. 



Known by its slender, almost unbranched, terete stems, often intermingled with 

 other mosses in bogs, and looking somewhat like weak, slender forms of H. 

 cuspidatum, but not cuspidate and acute at the tips as in that species, and quite 

 distinct in the single-nerved leaves. H. trifarium is quite distinct m its rigid, brittle, 

 more turgid stems with much wider leaves ; H. sarmentosum in the very different 

 colour, the more branched stems, frequently apiculate leaves, etc. ; H. cotdifolium in 

 the much wider leaves with large cells. 



35. Hypnum trifarium W. & M. (Amblystegium trifarium 



De Not.) (Tab. LIX. I.). 



More robust than the last ; stems rigid and very brittle, more 

 turgid and julaceous, of a duller, darker, brown colour. Leaves 

 closely and very regularly, somewhat spirally imbricated, in 3 or 

 more rows, very concave, widely ovate or sub-orbicular, widest 

 about the middle, very obtuse, nerved to or beyond the middle, 

 not plicate, entire ; cells linear-vermicular, somewhat incrassate, 

 obtuse, 10-15 times as long as wide, not distinctly shorter at apex ; 

 all basal large, lax, hyaline, hardly distinct at angles. Dioicous. 



Hab. Deep mountain bogs and pools ; very rare ; Scotch Highlands. Fr. 

 extremely rare, not found in Britain. 



A very distinct species ; in the leaves somewhat resembling H. dilatatum, but 

 quite distinct in the habit, colour, and brittle texture, as well as in the single nerve. 

 The leaves are much wider than in the last species, and indeed the resemblance 

 between the two plants is not great. The leaves are so concave that they almost 

 always split from the apex downwards on being flattened. 



36. Hypnum cordifolium Hedw. (Amblystegium cordi- 



folium De Not.) (Tab. LIX. L.). 



Tall, 4-8 inches, slender ; stems more or less erect or 



