36 NEW BRITISH LICHENS. 



limitatns ; apothecia nigra parva plerumque aggregatafere lecidci- 

 formia, epitbeciis rimiformibus, in acei'vulis (latit. circa. 2 m.ni.), 

 appositis gyroso-plicatis, intus cinereo-fusca ; spor^ 8nfe, incolores 

 fusiformes (apicibus obtusis), 3-septatge, •017-"025 X "0045 m.m. ; 

 paraphyses vakle indistincta?, hypothecium fusco-nigrunii Pars- 

 inferior bymenii iodo coerulescens dein omnino vinose rubens. 



Ad corticem Ubii prope Grantown. 



Thallus reddish, buff-coloured, thin, hypotballus brown ; apo- 

 thecia black, small, for the most part aggregate, almost patelli- 

 form ; epithecia rimiform arranged, parallel or contorted manner 

 in the aggregations, cinereo- fuscous within; spores 8, colourless 

 fusiform with blunt apices, 3-septate moderate ; paraphyses very 

 indistinct; hypothecium nigro-fuscous. The lower half of the 

 hymenium at first only cwrulescent with iodine, then the whole 

 wine red. 



This lichen bears a certain affinity to the Arthoniaj, but the" 

 epitliecium is rimiform, and in a small proportion of cases single 

 apothecia are seen somewhat elongated. 



Opegrapha prosiliens. (Si'r/t. — Thallus albus vel albidus tenuis- 

 simus chrvsogonidicus ; apothecia prominula nigra ovata vel 

 oblonga, epithecio rimiformi marginibus prominulis rotundatis ; 

 spora? 8nee ineolores fusiformi-ellipsoide^, Sseptatajet 4-nucleata3, 

 halone cincts, •02--028 X "OOG-'OO? m.m. ; paraphyses satis bene 

 distinctaj irregulares ramosje, apicibus fiiscescentibus ; hypothecium 

 fuscum. Gel. hym. iodo vinose rubens coerulcscentia pra^cedenti 

 fere obsoleta. 



Ad arbores dccorticatas et emortuas prope Grantown. 



The gonidia are large and thickly entangled amongst the fibres 

 of the wood. Scattered here and there over the thallus are seen 

 pretty large nearly spherical Verrucas (latit. as much as "25 m.m.), 

 containing spermatia (•0()45--00G x "OOIS mm.). On short, simple 

 sterigmata. Thallus white or albicant, very thin, with orange- 

 coloured gonidia; apothecia prominent, black, ovate, or oblong, 

 epithecium rimiform, with prominent rounded margins ; spores 8^ 

 colourless fusiform- ellipsoid, 3-septate and very generally 4-nucleate, 

 surrounded by a gelatinous halo, rather large ; paraphyses pretty 

 distinct, branching with brownish apices ; hypothecium fnscons. 

 Gel. hym. wine-red with iodme. 



VezzucaYia aphorisasa. Strn. — Thallus maculis segregatis fusco- 

 nigris determinatis indicatus ; apothecia nigra, compluribus in 

 quavis maculte aggregatis, fere innata et hemispha^rica, perithecio 

 dimidiato ; sporaj (4-8) nae, incolores demum fuscse, oblongae, 

 1-septata?, •02--028 X 005- 007 m m. ; paraphyses numerosse, 

 divaricato-ramosfe, nonnihil indistincta^. Gel. hym., iodo levite, 

 coernlee vel violacee tincta. 



Ad corticem Ulni prope Grantown. 



