264 BRYACE^. [Polytnchum. 



Pogonatum^ with a broad costa ; lamellae numerous, not inflated 

 at the borders. Calyptra covei'ed with long hanging hairs. 

 Capsule on a long solid pedicel, quadrangular or rarely hexago- 

 nal, with a short subglobose or discoidal apophysis. Lid large, 

 plano-convex or conical, straight-beaked. Teeth of the peristome 

 generally 64. Spores very small. 



* Capsule hexagonal. 



1. P. gracile, Menz. Plants densely cespitose ; stems erect, 

 slender, very llexuous at the tomentose divided base, simple 

 above : leaves long, linear-lanceolate, sharply acuminate ; bor- 

 ders thin, erect, acutely dentate : capsule erect on a long pedicel, 

 horizontal when dry, hexagonal-ovate, covered by (he calyptra 

 nearly to the base ; lid long-rostrate frona a conical base, straight 

 or oblique; peristome of 64 unequal teeth. — Trans. Linn. Soc. 

 iv. 73, t. 6, fig. 3; Bryol. Eur. t. 42L 



Hab. Peat bogs of JSTorthern Ohio {Lesquereux) ; Lake Superior 

 (Agassiz); Rocky Mountahis (E. Hall). 



2. P. formosum, Hedw. Loosely cespitose ; stems long, 

 sometimes very long, erect from the prostrate base : lower leaves 

 very small, membranaceous, sheathing, open at tlie apiculate 

 point, the upper ojien and recurved from a long sheathing and 

 shining whitish base, glaucous-green above, loosely appressed 

 when dry, long linear-lanceolate ; margins erect, sharply dentate 

 to near the clasping base ; perichgetial leaves very long, erect : 

 calyj)tra descending to the base of the capsule : capsule on a 

 long fleshy pedicel, erect when moist, cernuous when dry, hori- 

 zontal when empty, hexagonal or triangular, Avith a distinct 

 apophysis ; lid conical at base, gradually long-acuminate, red on 

 the borders. — Spec. Muse. 92, t. 19; Bryol. Eur. t. 420. P. 

 attenuatum, Menz. 1. c. fig. 2; Lindb. Polytrich. 109 and 126. 



Var. pallidisetum, Bruch & Schimp. Stems shorter : 

 leaves shorter and bright green : capsule narrower, often sub- 

 cylindrical ; pedicel yellow, reddish at base only. 



Hab. Woods, in mountain regions; the variety in subalpine regions. 



* * Capsule quadrangvlar. 



3. P, piliferum, Schreb. Loosely cespitose ; stems simple, 

 from radiculose siibterranean creeping shoots, erect, naked 

 below : lower leaves very small, ajjpressed, scarcely visible, the 



