Hifpnum.] BRYACE^. 357 



106. H. denticulatum, Linn. ]\ronoecions : in flat loose 

 green or yellowish glossy tvifts ; stems prostrate, stolon if erous, 

 with branches and branchlets erect, piano-foliate : basilar and 

 terminal leaves of the bi-anches small, broadly lanceolate, acute, 

 the medial larger, ovate-oblong, apiculate, inequilateral, decur- 

 rent, entire or subserrate at the apex ; costa bij^artite, very thin, 

 vanishing half-way to the middle ; areolation narrowly rhom- 

 boidal, enlarged at base, broadly quadrate at the excavate 

 angles; perichfetial leaves sheathing, narrowed into a short 

 point, costate to above the middle, the costa thin, simple or 

 forking: capsule long-pedicelled, cernuous, arcuate, cylindrical 

 or oblong, orange-color, slightly constricted under the orifice 

 when dry ; 02">erculum conical, apiculate ; teeth ^ale ; segments 

 slightly open between the articulations ; cilia two or three, un- 

 equal, nearly as long as the segments ; annulus large, of a triple 

 row of cells. — Spec. PI. 1122. Pylaiscea radicans, Desv. ; 

 Brid. Bryol. Univ. ii. 282, t. 8. PlagiotJiechan de/iticuJatum, 

 Bruch & Schimp. Bryol. Eur. t. 501, 502 ; Lindb. Faun. Flor. 

 Fenn. ix. 30. 



Var. tenellum. Smaller than the normal form : leaA^es 

 narrowei", longer-acuminate. — Bruch & SchimiD. 1. c, as Plagi- 

 othecium. 



Var. Isetum. Leaves longer, piliform-acuminate : cajjsule 

 ovate-oblong, suberect ; cilia none. — Lindb. 1. c. Plagiothe- 

 cium hvtum, Bruch & Schimp. Bryol. Eur. t. 495. 



Var. laxum. Leaves less crowded, erect-spreading, scarcely 

 flattened, smaller, narrower, broadly lanceolate : capsule sub- 

 erect. — Bruch & Schimp. 1. c. 



Var. densum. Densely cespitose ; branches shorter, erect : 

 leaves crowded, imbricate, recurved at the apex : capsule sub- 

 erect; lid acuminate. — Bruch & Schini]!. 1, c. 



Var. obtusifolium, Turn. Leaves elliptical, more or less 

 obtuse. — Muse. Hibern. 146. IT. Ponnianum, Smith, Fl. Brit, 

 iii, 1286. Stereodon Do7iianus, Mitt. 



Hab. Decayed trunks in the Avoods, rarely on stones; varieties 

 tenellwn and densum on mountains, in fissures of rocks. 



A very variable moss, often confounded witli //. ftijlvaticiim, diifering 

 in tiie moncpcious inflorescence, the narrower areolation, the conical and 

 not rostrate lid, the smooth capsule, and the compound annulus. 



107. H. Muellerianum, Hook. fil. Dioecious: plants very 

 small, loosely cespitose, bright green ; stems stoloniferous, creep- 



