POTTIA. 171 



incrassate than is usual in the former plant. This is also the view taken by Husnot 

 (Muscol. Gall., pp. 76, 433), who remarks that M. Corbiere has found the above 

 characters gradually disappear in proportion to its distance from the sea. 



* Pottia viridifolia Mitt. (Tab. XXVI. B.) 



Resembling P. intermedia, but with the leaves octofarious , 

 densely crowded into a comal tuft, bright green, widely spathu- 

 late, obtuse, the upper cells highly chlorophyllose ; plant more 

 rigid. Seta short ; in other respects the fruiting characters are 

 almost exactly those of the sub-spec, intermedia. Peristome 

 entirely wanting. Paroicous. 



Hab, Ledges of rocks near the sea, rare. Fr. winter. 



The broader more obtuse leaves and their octofarious arrangement are the only 

 structural points of any importance which serve to separate this plant from P. 

 intermedia, though the colour and the more numerous leaves assist in distinguishing it 

 in the field. It differs from P. asperula and P. Wilsoni in the smooth calyptra and 

 less papillose leaves ; from P. crinita in the short point. I am unable to regard it as 

 anything more than a sub-species of P. truncatula nearly allied to P. intermedia. 



5. Pottia crinita Wils. (Tab. XXVI. C). 



In dense tufts, bright green. Leaves octofarious, broadly 

 oblong-spathulate, obtuse ; margin recurved, nerve excurrent in 

 a long yellowish arista, "4 length of leaf ; upper cells quadrate- 

 hexagonal, lax, papillose, distinct ; margin at apex crenulate with 

 papillae. Calyptra smooth. Capsule oval-oblong, with a rather 

 distinct neck, thin-walled, reddish-brown, rather wide-mouthed 

 when empty ; lid obliquely rostellate ; spores rather large, densely 

 and very minutely granulated ; peristome none. Paroicous, 

 antheridia naked in the axils of the upper leaves. 



Hab. Sea coasts, on rocks and banks ; here and there on various parts of the 

 coast, not unfrequent in the south. Fr. winter. 



Distinguished by its smooth calyptra and broad obtuse octofarious papillose leaves 

 from all but P. viridifolia, from which it is at once known by the long hair-point. 



6. Pottia Wilsoni B. & S. (Gymnostomum Wilsoni Hook.) 



(Tab. XXVI. D.). 



Resembling P. crinita, but differing in the hair-point being 

 shorter, rather cuspidate than piliferous, the upper cells much 

 smaller, and very obscure with chlorophyll and numerous papillae, 

 the calyptra rough, the capsule oblong-cylindric, longer and 

 narrower, with a distinct neck, and slightly contracted at the 



