Hypnace^.] 55 [Amhlystegium. 



Hyp. crassum Schum. PI. Sael. ii, 84. 



Hyp. fuscum Schleich. 



Amblystegium scorpioides Lindb. muse, scand. 33 (1879). 



Dioicous ; in large soft blackish-green or rufous and black tufts. 

 Plants tall, procumbent or ascending, dichotomous, with few distant 

 unequal ramuli, arcuato-incurved at apex, turgidly leafy, olivaceous- 

 green, rufous-purple or blackish. Leaves crowded, secund, imbricated, 

 here and there falcate, from a narrow base, broadly ovate or ovate- 

 oblong, shortly acuminate, concave with the wings incurved to apex, 

 rugose and undulated when dry ; nerve very short, faint, single or 

 double ; cells long, very narrow and linear, slightly dilated and 

 rectangular at insertion, but without any distinct angular cells. 

 Perichsetium elongated, laxly imbricated, bracts acutely acuminate, 

 many-sulcate, with a thin nerve ; vaginula long, slightly pilose, seta 

 long, purple ; capsule oblongo-cylindric, arcuate, sulcate, constricted 

 below the mouth, lid convex-conic, annulus broad ; peristome pale 

 yellow, cilia 3 — 3. 



Hab. — Spongy alpine bogs, not uncommon. Fr. 6 — 7, rare. 



Malham tarn c. fr. {Nowell). Wybunbury bog 0. fr. (Wilson) ! ! Bowness c. fr. 

 (Barnes 1864). 



Sect. 5. HYGROHYPNUM Lindb. Plants prostrate or depressed, 

 with irregular ascending branches. Leaves ovato-lanceolate to orbicular, 

 rarely patent, subsecund or decurved, nerve slender, generally unequally 

 forked ; cells linear, very narrow. Capsule turgid ovate or oblong, incurvo- 

 cernuous. 



Schimper's name LimnoUum cannot be retained for this group, as it was 

 already in use for a genus of Hydrocharidacese (Richard in Mem. Inst, ii, 

 £6— 1811). 



The species form a very natural section, but some are very closely 

 allied and difficult to distinguish from each other. 



Clavis to the Species. 



Leaves oval or circular, obtuse. 



Nerve single, sometimes cleft, reaching above middle. Smithii. 



short, forked. 



Leaves oval-suborbicular, subsecund at apex. dilatatum. 



oval, narrovifed tovifard point, erecto-patent. molle. 



oblong-lanceolate, acuminate. 



Dioicous ; perich. bracts not plicate. ochraceum. 



Autoicous ; perich. bracts plicate. 



Nerve long, single, basal angles not excavate or auricled. palustre. 



none, or short faint and bifurcate, basal angles excavate, of 



orange cells forming auricles. eugyrium. 



