— 284 - 



VII. Gymnostomiim. Capsule sometimes but r. with peri- 

 stome; lid deciduous not S3'stylic; annulus often present. Leaves 

 sublinear not recurved; cells gen. subquadrate, the upper us. 

 opake and very small. 



I. Euoladium Br. eur. 

 l.W.verticillata L. — Bryum L.; Weisia C. Mueller. 



Leaves carinate brittle from short ovate base somewhat 

 abruptly narrowed to the nearly subulate acumen; inner basal 

 cells much larger than the outer. Capsule brownish suboblong; 

 teeth cleft or perforated. Tufts eradiculose us. encrusted with 

 calcareous deposite. R. fruiting. — Dripping calcareous or 

 sandstone rocks. Eur. princ. in southern distr. not r. Switzerl.! 

 Sweden very r.! Spain: Levier; Dieck, com. Roell. Greece: 

 Heldreich. Amer. r. Can.: Macoun. 



II. Pseudo-Pottia Kindb. 



A. Leaves not recurved. Peristomial teeth well-evolute more 

 or less perforated; annulus distinct. Monoecious. 

 2.W.caespitosa Bruch. ■ — Pottia C. M.; Trichostomum Jur. 



Leaves suboblong acute or short-acuminate; basal cells small 

 short-rectangular; costa short-excurrent, Capsule subovate small- 

 mouthed us. twice longer than the rostellate lid; pedicel yellow. 

 Often loosely tufted. — Bare calcareous soil in warmer distr. 

 r. Eur. France: Philibert; Brebisson. Germany: Schemmann. 



B. Leaves recurved. Peristome us. imperfect or wanting; 

 annulus not distinct. Paroecious. 



S.W.Starhei Hedwig. — Pottia C. M. 



Leaves subobovate-oblong or narrower, acute or short-acumi- 

 nate, recurved nearlj' all around; basal cells rectangular; costa 

 gen excurrent. Capsule oval-oblong; lid short thick subconic 

 or obtuse; pedicel us. yellowish. Us. not tufted. Smaller than 

 the last. — Fallow fields and banks. Eur, not r. Sweden: 

 Hamnstroem. France: Bouvet. Greece: Heldreich. Amer. r. 

 »U. S.»: Lesq. et Jam. 



* W.DaTallii Smith. — Gymnostomum Sm.; Weisia Kindb.; 

 Pottia minutula Br. eur. 



Capsule subovate; teeth none; pedicel reddish. Leaves often 

 rufescent when old. Very small. — Eur. not r. Sweden, Swit- 

 zerl.l Amer. r. »JJ. S.»: Lesq. et Jam. 

 *W.iimtica Venturi. — Pottia Vent.; Weisia Kindb. 



Leaves with subpercurrent costa. Peristome rudimentary. — 

 Dolomitic rocks r. Eur. Switzerl: Mari. 



