268 BRYACE^. [Buxbaumia, 



Annulus narrow or very large, forming a solid irregularly erose 

 dentate margin (outer peristome of authors). 



1. B. apliylla, Linn. Annulus very broad, as high as the 

 middle of the inner peristome ; outer j^eristome composed of 

 pale irregular segments, slightly exceeding the annulus ; outer 

 wall of the capsule detached below the orifice after the fall of 

 the lid, laciniate and revolute. — Amcen. Acad. v. 83, t. 1 ; 

 Bryol. Eur. t. 427 and 428"- 



II AB. Oil the ground, especially of granite regions and mountains; 

 White Mountaius; Cascade Mountains, etc. [Lyall). 



Series II. CLADOCARPI. 



Flowers terminal at the apex of short lateral branches. 



Tkibe XVI. FONTINALE^. 



Aquatic mosses, with stems more or less branching, bearing 

 radicles at their base only. Leaves three-ranked, thin, smooth, 

 ecostate ; reticulation sliglitly chlorophyllose ; periclisetial 

 branches short, transformed at the apex into a vaginule ; peri- 

 chaatium densely imbricate, sheathing. Calyptra conical or 

 cucidlate, naked. Capsule sessile, emersed. Peristome double, 

 the outer of 16 long teeth, transversely articulate, latticed on 

 the inside, the inner of 16 cilia united into a 16-carinate cone, 

 latticed by transverse partitions. 



100. FONTINALIS, Dill. (PI. 4.) 

 Plants floating in water, generally long. Stem irregularly 

 branching or fasciculate-ramose. Leaves very concave or 

 acutely carinate, with a narrowly rhomboidal or vermicular 

 areolation generally enlarged at the auriculate base. Flowers 

 dioecious, small, with few antheridia, archegonia and paraphyses. 

 Annulus none. 



1. F. antipyretica, Linn. Leaves broadly ovate, acumi- 

 nate, entire, sharply carinate-plicate ; borders reflexed on one 

 side toward the angular slightly auricular loosely areolate base, 

 green when young, olive-color or blackish and often split along 

 the keel when old; areolation long hexagonal-rhomboidal j 



