ToRTULACE^.] 258 . [Barbula. 



basal cells small, rectangular, slightly hyaline, upper small, incrassate, 

 rotundate, or quadrate. Caps, oval or cylindraceous, peristome of 

 16 teeth on a very short membrane, cleft to base into two slender legs, 

 papillose, short or imperfect, or longer and spirally twisted, sometimes 

 wanting. Der.—barba, a beard. 



Although Barbula and Tortula have generally been corhbined, and must be 

 if we limit our views by the peristome alone, the habit and general aspect of 

 the species are so distinctive, that it is far more convenient to keep them 

 separate. These in Barbula are the rusty tinge which more or less pervades 

 the plants, and the lanceolate leaves gradually tapering to an acute point, 

 appressed when dry, with recurved margins, the cells of the upper part being 

 rounded or quadrate and well defined. We have also in Europe B. bicolor 

 Br. Sch. — B. Lamyi (Schimp.) — B.cordata (Juratz.) — B. rufa (Lorentz) 

 — B. fiavipes Br. Sch. — B. gigantea Funck — B. crocea Brid. — B. icmadophila 

 Br. Sch. and B. obtusula Lindb. Schimper's B. Woodii is nothing but 

 A mphoridium Mougeotii. 



Clavis to the Species. 



Gymnostomous. curvirostris. 



Peristoraate. 



Leaves without thickened limb. 

 Peristome short, erect. 



Infl. paroicous, lower leaves red. rubella. 



Infl. dioicous. 



Leaves acute, nerved to apex. 



L. ovato-lanc, basal cells rounded, per. short, pale, lurida. 

 L. lanc.-acuminate, basal cells rectang. per. longer, 



red. rigidula. 



Leaves obtuse, nerve vanishing below apex. 



L. short, ovato-lanc, caps, oblong. brevifolia. 



L. long, lanc.-acuminate, caps, cylindric. spadicea. 



Peristome elongated, contorted. 



Leaves squarroso-recurved. 



L. dense, gradually acuminate, acute. fallax 



L. distant, strongly recurved, short pointed. reflexa. 



Leaves erecto-patent. 



L. points acuminate, very acute. 

 Nerve excurrent. 



L. ovate acuminate, aristate with the thin 



nerve. acuta. 



L. ovato-lanc. cuspidate with the thick nerve. Hornschuchii. 

 Nerve vanishmg just below apex. 



Margin of leaf entire. cylindrica. 



Margin sinuous in upper part, serrate at apex, sinuosa. 

 L. points short, obtuse. 



Perich. bracts large, convolute. couvoluta. 



Perich. bracts not conspicuous. 



L. short, linear, revolute at margin revoluta. 



L. oblong-lanc, margin revolute in lower 



half. unguiculaia. 



Leaves surrounded with a thickened limb. mucronata. 



Sect. I. HYMENOSTYLIUM (5ni.) TaU, densely cffispitose, much 

 branched. Capsule ovate or oval, truncate, gymnostomous ; lid with a long 

 beak. 



