TORTULACE^.I 261 [Barbula. 



patent and recurved when moist, the lower lanceolate, upper suddenly 

 larger, from an erect concave base, lineal-lanceolate, acuminate, carinate, 

 minutely papillose on. both sides, the margin recurved, nerve terete, 

 vanishing below or in the apex ; cells at base pellucid rectangular, above 

 small quadrate and chlorophyllose. Perich. bracts longly sheathing, 

 thin ; caps, erect, on a long reddish seta, cylindraceous, rarely oblong 

 or oval, leptodermous, pale brownish-green, finally reddish ; annulus of 

 two rows of large cells, very fragile, lid conic, with a short straight or 

 slightly oblique beak; per. on a short basal membrane, pale red, soft, 

 of 16 flat linear teeth, rarely cleft or perforated, the articulations nodose 

 and papillose. Antheridia usually naked in the axils of the perich. bracts. 



HAB. Walls, rocks and stony ground, principally in subalpine districts. 

 Fr. 89. 



Var. /? dentata (Schimp.) 



Plants dingy green, the leaves longer, with the margin recurved only to 

 the middle and toothed toward apex. 



SYN. Didymodon rubellus ft dentatus SCHIMP. Synops. 131. 

 Didymodon dentatus JURATZ. MSS. 

 Trichostomum alpigenum VENT. MSS. 

 Didymodon alpigenus JURATZ. Laubm. oesterr.-ung. 98. 



HAB. Wet stony places on mountains. 



Clayton downs, Sussex (Mitten) \ Schiehallion (Braithwaite 1884) ! ! Coneysthorpe, 

 Yorks. (Spruce 1878). Miller's dale (Holt 1879) ! ! Ingleborough (Cash 1880) ! ! 



VAR. y. ruberrima (Fergusson). 



Plants more slender, slightly branched, ^ 2in. high ; leaves short, more 

 distant, all vinous red, entire, from an oblong base, suddenly narrowed near 

 the middle and incurved at margin, acutely acuminate. 



HAB. Mountain rocks. 



Head of Glen Lochay (Arnott and Borrer) ! Glen Tilt (West 1880) ! ! Ben Lawers 

 (Braithwaite 1865) ! ! Clova (Fergusson) ! ! 



Barbula rubella varies considerably in size and density, but is very uniform 

 in the fruit, and always more or less red in the lower leaves. In Var. /3. the 

 denticulation varies much, but in no case have I seen it so spinulose as in 

 continental specimens. The Var. y. differs widely from the type, and has 

 quite the aspect of a distinct species, indeed it was recorded as Didymodon 

 rufus LORENTZ, but Barbula vufa has a broader leaf, gradually narrowing 

 upward, the base of different shape with smaller and more numerous cells, 

 and the areolation of upper part not opaque and indistinct. 



Sect. 3. EUBARBULA Lindb. Plants slender or robust, young leaves 

 green, becoming more or less of a rusty brown colour, lanceolate with 

 recurved margins ; caps, narrow, teeth short or rudimentary, or long and 

 convolute. 



