102 LECANO-LECIDEEI [lECIDEA 



either crowded and variously angulose or thin graaulose and scat- 

 tered, while at times it is subevanescent. The single British specimen 

 is well fertile, though the thallus is for the most part but little 

 developed. The spermogones are large, black, subglobose and vari- 

 ously corrugate, with spermatia shortly cylindrical, about 0,003 mm. 

 long. 



Hah. On the stump of an old fir tree in a wooded mountainous 

 region. — B. M. BaUochbuie Forest, Braemar, Aberdeenshire. 



190. L. pycnocarpa Koerb. Parerg. Lich. p. 213 (1861). — 

 Thallus warted, or warted-areolate whitish or dark-ashy-grey; 

 hypothaUus indistinct (K + yeUow, CaCl — ). Apothecia minute, 

 black, somewhat convex, immarginate, conglomerate in dense 

 orbicular groups; hypothecium dark-brown; paraphyses coherent, 

 dark-brown towards the apices; spores linear-oblong 0,012—17 mm. 

 long, 0,003-6 mm. thick ; hymenial gelatine and asci blue then 

 wine-red with iodine. — L. symphoreUa Nyl. in Flora Ixiii. p. 35 

 (1870) ; Cromb. in Journ. Bot. viii. p. 98 (1870) ; Leight. Lich. 

 Fl. p. 301 ; ed. 3, p. 286. L. amphotera Leight. ex Cromb. in 

 Journ. Bot. ix. p. 179 (1871) & Lich. Fl. p. 183 ; ed. 3, p. 287. 



Hob. On granitic and sandstone rocks. — Distr. Bare in moun- 

 tainous places, N. Scotland. — B. M. Ben Lawers, Craig Tulloch, 

 Ben-y-Gloe, Blair Athole, Perthshire ; Morrone, Braemar and Hill of 

 Ardo, Aberdeenshire. 



191. L. assimilis Th. Fr. Lich. Scand.p. 556 (1874).— ThaUus 

 rather thin, areolate-warted or conglomerate, brownish-favoi- 

 coloured or sordid (K— , CaCl— ). Apothecia minute, sessile or 

 adnata, at first concave with a prominent margin, becoming plane 

 or slightly convex ; hypothecium colourless ; paraphyses slender, 

 involved in gelatine, towards the tips a clear greenish-blue colour ; 

 spores ellipsoid, with a thin epispore, 0,011—13 mm. long, 

 0,005—7 nun. thick ; hymenial gelatine deep blue with iodine. 



In our specimens the spores are somewhat smaller than the size 

 given by Th. Fries, measuring from 0,008 x 4 mm. upwards. The 

 beautiful blue colour of the epithecivun is very marked. 



Hah. On rocks. —B. M. Ben Lawers, Perthshire. 



192. L. commaculans Nyl. in Flora li. p. 476 (1868). — 

 ThaUus e£Fdse, thin, opaque, subareolate, the areolae scattered, 

 depressed, greyish- or brownish-black (K— , CaCl—). Apothecia 

 submoderate, slightly convex, scarcely margined, black, con- 

 colorous within ; paraphyses concrete ; epithecium blackish ; 

 hypothecium thickish, reddish-brown, the colour passing into the 

 hymenium ; spores oblong, 0,008-11 mm. long, 0,003-4 mm. thick ; 

 hymenial gelatine bluish with iodine. — Cromb. in Journ. Bot. 

 vii. p. 106 (1869) & Lich. Brit. p. 93 ; Leight. Lich. Fl. p. 282 ; 

 ed. 3, p. 287. 



Approaches L. Tcajanita Xyl., a Scandruavian plant, but differs ia 

 the form of the spores and especially in the colour of the hypothecium. 



