COLLEMOPSIS.] COLLEMEI. 79 



and less developed conditions of Lecanora ceroina. In this country it 

 sometimes occurs associated with the preceding species, from which it is 

 distinguished by the thallus and the apothecia ; though neither of these 

 are well developed in the British specimens. 



Hab. On calcareous rocks in maritime and upland tracts of mountainous 

 regions. Distr. Very local and rare in S.W. Ireland (near Kemnare, co. 

 Kerry) and the Central Highlands of Scotland. B. M. : Craig Tulloch, 

 Blair Athole, Perthshire. 



3. C. fttrfurella Nyl. ex Oromb. Journ. Bot. 1874, p. 332. 

 Thallus effuse, very thinly furfuraceo-granulose, or scattered in 

 small furfuraceous verrucas, brownish-black or blackish, with some- 

 what larger, convex granules intermixed. Apothecia minute, sub- 

 pyrenodeo-lecanorine, impressed in the larger granules, concolorous ; 

 spores shortly ellipsoid, 0,011-17 mm. long, 0,008-11 mm. thick ; 

 paraphyses discrete; hymenial gelatine wine-red with iodine. 

 Nyl. Flora, 1881, p. 453 ; Leight. Lich. Fl. ed. 3, p. 35. Collema 

 furfurellum Nyl. Sallsk. pro F. et Fl. Fenn. Not. iv. (1859) p. 229 ; 

 Lich. Scand. p. 28 ; Carroll, Journ. Bot. 1865, p. 286 ; Cromb. Lich. 

 Brit. p. 3 ; Leight. Lich. Fl. p. 1 7. 



The anatomical structure of the thallus shows this plant, at one time 

 regarded by Nylander as a distinct section of Collema, to be a Collemopsis. 

 The thallus and fructification distinguish it from the allied species. The 

 apothecia are numerous, though the spores are rarely found fully deve- 

 loped. The spermogones are only sparingly visible, the spermatia being 

 thin, oblongo-cylindrical. 



Hab. On moist schistose rocks in alpine places. Distr. Found very 

 sparingly amongst the S. Grampians, Scotland. B. M. : Above Loch-na 

 Gat, Ben Lawers, Perthshire. 



4. C. Arnoldiana Nyl. Flora, 1874, p. 305. Thallus effuse, thin, 

 maculate, granulose, olive-brown or dark-brown. Apothecia small, 

 biatoriue, somewhat prominent, impressed in the centre, reddish or 

 dark-red, the margin paler ; spores ellipsoid, oleoso-locular, 0,017- 

 20 mm. long, 0,010-0,0105 mm. thick; paraphyses articulate; 

 hymenial gelatine slightly bluish, then pale wine-red with iodine. 

 Cromb. Journ. Bot. 1876, p. 359 ; Leight. Licb. Fl. ed. 3, p. 36. 

 Physma Arnoldiana Hepp, Flora, 1858, p. 94. 



This somewhat resembles Leptof/ium biatorinum, but is smaller, thinner, 

 and with different spores. The thallus is minutely cellular, lax, and 

 indistinct in texture. The apothecia, which are nearly gyalectiform, are 

 either somewhat scattered or approximate. Verrucaria Flotoviana Hepp, 

 Flecht. n. 02 pro parte, Collemopsis Flotovictna Nvl. e.c Cromb. Jouru. Bot. 

 1874, p. 147, scarcely differs from this species. 



JIab. On calcareous stones in shady upland situations. Distr. Appa- 

 rently local and rare in S. and W. England. B. M. : Near Shiere, 

 Surrey ; near Cirencester and Chalford, Gloucestershire. 



5. C. oblongans Nyl. Flora, 1874, p. 305. Thallus subeffuse, 

 thin, granuloso-crustaceous, confluent, brownish-olive. Apothecia 



