344 BRYACE/E. 



hardly decurrent, and the cell-walls not at all incrassate ; on the other hand, fine 

 fruiting plants collected by Grebe in Thuringia and distributed as M. Seligeri (but 

 which should doubtless be classed as M. affine var. datum), have the spines very 

 long and slender, formed of three cells, but the leaves very strongly decurrent, and 

 convex on the upper surface. 



2. Mnium cuspidatum Hedw. non Neck. (M. silvaticum 



Lindb., Braithw. Br. M. Fl.) (Tab. XLVI. D.). 

 Less robust than M. affine ; young shoots bright pale green, 

 older stems dark green ; in wide patches. Sterile shoots 

 prostrate or suberect, slender. Stem leaves decurrent, oval- 

 oblong, the upper larger, 1-2 lines long, obovate-spathulate ; 

 those of the branches shorter, smaller, rounded-oval ; all acute, 

 shortly cuspidate, much crisped when dry ; border of 3-5 rows of 

 yellowish cells, with a single row of small spinose teeth in the 

 upper half, each tooth as a rule composed of a single spiniform 

 cell ; nerve vanishing below or in the cuspidate point. Cells 

 small, about 20 p in diameter, hexagonal, somewhat incrassate, 

 not seriate, at apex rather smaller, at base somewhat larger and 

 longer, sub- rectangular. Seta pale, solitary ; capsule pale, sub- 

 pendulous, oval-oblong, lid conical, obtuse ; peristome yellow. 

 Synoicous. 



Hab. Damp ground and rocks in woods, etc. ; common. Fr. spring. 



A smaller species than the last, and readily distinguished from that and M. 

 rostratum by the cells only about half the size, not arranged in radiating rows, and 

 more angular. It may be recognised in the field by the smaller, shorter, more acute 

 leaves, with the borders more finely and sharply toothed. All the other species with 

 bordered and serrated leaves have them usually narrower and longer and always with 

 double rows of teeth. 



3. Mnium rostratum Schrad. (Tab. XLVI. F.). 



Dark green, in loose patches. Stems erect, short, sterile 

 branches long, prostrate or arched. Leaves usually oblong or 

 slightly obovate, less tapering at the base, rounded and obtuse 

 and often flattened at the summit, with a short apiculus, slightly 

 decurrent, crisped and undulated when dry; those on the sterile 

 shoots two-ranked, somewhat complanate ; comal leaves of the 

 stems much enlarged, 2-2^ lines long ; margin strongly bordered, 

 with a single row of irregular teeth in the upper half, which are 

 usually small, thick, and obtuse, often almost obsolete; nerve 

 reaching apex ; cells resembling those of M. affine, but a little 

 smaller, about 25 fi in their shortest diameter, slightly incrassate. 

 Capsules often aggregate, horizontal or sub-pendulous, oblong- 

 oval, pale ; lid with a long, straight or curved, rostrate beak, 

 yellow; calyptra rather persistent ; peristome yellow. Synoicous. 



