224 TORTULACE^. 



Tribe J. Cinclidotese. 



Plants robust, aquatic or riparian ; leaves large, solid in 

 texture, bordered. Capsule immersed or exserted. Peristome 

 of 16 slender teeth bi-trifid above, more or less clathrate below 

 with connecting bars. 



45. OINGLIDOTUS P. Beauv. 



Characters those of the Tribe as given above. The fruit is 

 sometimes apical, but typically cladocarpous, being produced at 

 the extremity of short lateral branches. The aquatic species 

 have a facies somewhat approaching Fontinalis, being dark-hued 

 and long-stemmed, with long, blackish leaves. The European 

 species are all dioicous. 



{Plant elongate, usually floating ; capsule immersed .3. fontinaloides 

 Plant short, more or less erect ; capsule exserted z 



{Leaves densely papillose j- Brebissoni 

 Leaves smooth ^. riparius 



1. Oinclidotus Brebissoni Husnot (Tortula Brebissoni 



Fior-Mazz. ; Barbula mucronata Brid., Braithw. Br. M. FL, 



Vol. I., p. 276 ; Cinclidotus riparius var. terrgstris 



B. & S., Schp. Syn.) (Tab. XXXII. F.). 



Terrestrial, erect, in large soft tufts, 1-2 inches high, dark 

 green above, blackish below, slightly branched. Leaves larger 

 and more crowded at the summit of the stem, erecto-patent or 

 spreading, spirally twisted when dry, especially the younger 

 ones, i-s'/i lines long, broadly -Ungulate, rounded and obtuse, 

 shortly mucronate with the thick, excurrent nerve ; margin 

 strongly revolute to apex, becoming united and thickened above ; 

 cells at base hyaline, shortly rectangular, small, above very 

 small, rounded-hexagonal, very chlorophyllose and opaque, 

 densely papillose on both sides. Seta stout, terminal, yellowish 

 brown, 3-5 lines long ; capsule cylindric, rather large, narrowed 

 at the mouth ; lid rostellate or shortly rostrate ; annulus none ; 

 peristome rather short, once twisted, teeth from a very narrow 

 basal membrane, red, slender, papillose, fragile. 



Hab. Roots and stumps of trees by water. Not common. Fr. spring and 

 early summer. 



This species bears some resemblance to Tortula mutica ; but that is of a more 

 lurid, yellowish colour, with broader, spathulate leaves which are less twisted when 

 dry, and which have the nerve hardly excurrent and less distinct at back, not con- 

 spicuously pale and shining as it is in the present plant. It is very nearly allied to- 



