LECANORA.] LECANO-LECTDEEI. 443 



or testaceo-reddish, the thalline margin thickish, crcnate ; spores 

 ellipsoid, 0,009-11 mm. long, 0,00(5-8 mm. thick ; paraphyses 

 moderate, granulato-inspersed, not very discrete, epithecium brown- 

 ish ; hymeuial gelatine bluish, then yellow (the thecae tawny- 

 yellow) with iodine. Cromb. Journ. Bot. 1874, p. 148 ; Leight. 

 Lich. Fl. ed. 3, p. 184. 



More closely allied to L. subventosa Nyl., a North- American plant, 

 than to any British species of this section. In the two specimens seen 

 the thallus is more or less scattered, with the hypothallus scarcely visible. 

 The apothecia in these are either scattered or crowded ; the spermogones 

 are seldom present. 



Hal. On granitic rocks in a maritime district. Distr. Ouly sparingly 

 in the Channel Islands ; (erroneously recorded by Leighton from N. W. 

 Ireland). B. M. : Vale Castle, Island of Guernsey. 



e. Thecse polyspored. 



133. L. Sambuci Nyl. Lich. Scand. (1861) p. 168. Thallus 

 effuse, very thin, granulose or subleprose, whitish or greyish, often 

 nearly evanescent (Kf+ yellowish, CaCl ). Apothecia minute, 

 plane, brown or reddish-brown, the thalline margin persistent, more 

 or less crenulate, white; spores 12-16-32na3 (rarely 8na3), ellipsoid, 

 0,008-12 mm. long, 0,005-7 mm. thick ; hymenial gelatine bluish, 

 then pale-violet with iodine. Carroll, Journ. Bot. 18o'6, p. 23 ; 

 Cromb. Lich. Brit. p. 53 ; Leight. Lich. Fl. p. 186, ed. 3, p. 171. 



A rather inconspicuous plant resembling L. Hageni, from which it is 

 well distinguished by the numerous spores. These in the single British 

 specimen seen are usually 12na3, though they vary in plants from other 

 countries from 8nae to 32nse in the same apothecium. The thallus, 

 when whitish, gives a positive reaction with K, as stated by Th. M. Fries 

 (Lich. Scand. p. 248), but this is scarcely visible in our specimen, in 

 which the thallus is nearly evanescent. 



Hub. On trunks of trees, chiefly poplars, in upland tracts. Distr. Very 

 sparingly among the S. Grampians, Scotland, and in N.E. Ireland (co. 

 Armagh.). B. M.: Craig Calliach, Perthshire. 



F. Apothecia usually biatoroid ; spores 8nae or 16nae, simple or 1-3- 

 septate, colourless ; hymenial gelatine variously tinged with 

 iodine. Spermogones with simple sterigmata and arcuate 

 spermatia. (Lecania Mass. Alcun. Gen. (1853) p. 12.) 



134. L. erysibe Xyl. Mem. Soc. Cherb. t. v. (1857) p. 114, Lich. 

 Scand. p. 167. Thallus effuse, thin, diffract, leproso-granulose, 

 greyish- or greenish-olive, or sordid-greyish (K , CaCl ). Apo- 

 thecia small, innato-sessile, plane or convex, brownish-red or livid- 

 testaceous, the thalline margin little distinct or evanescent ; spores 

 oblongo-ellipsoid, simple or often thinly 1-septate, 0,010-16 mm. 

 long, 0,004-6 mm. thick ; hymenial gelatine bluish with iodine. 

 Cromb. Lich. Brit. p. 53 ; Leight. Lich. Fl. p. 228, ed. 3, p. 218. 



