56 BERNT LYNGE. M.-N. Kl. 



Ex si C. Anzi Lang. 54 B, Anzi Lieh. Ven. 21, Arnold 64 a, Hepp 



875, SCHAER. 486. 



Tliallus up to 12 — 13 cm. large, fragile, easily loosened from the 

 substratum. Laciniae imbricate, at the circumference usually slightly ap- 

 pressed, in the centre more or less ascending. They vary: short and 

 broad (to 3 — 4 mm. broad) laciniae, ascending even at the circumference, 

 with their ends widened like a fan, profoundly incised with crenate lacinuli, 

 — or long and narrow (0,5 — 0,7 mm.), plane, multifid, dior trichotomously 

 branched, with rounded or truncate ends. More rarely the laciniae are 

 short and narrow to filiform (0,2 — 0,5 mm. broad), multifid, ascending or 

 erect, closely imbricate or even panniform. Surface opaque, smooth, 

 without soredia, usually without (in var. isidiata m. with) isidia. Thai lu s 

 with white, caesious, or bluish violet pruina, either only at the 

 ends of the laciniae or over the whole surface. Colour brownish, 

 more or less dark chestnut-brown or greyish-brown (varies also with the 

 pruina), moistened with a distinct tinge of green. Below black, paler 

 at the circumference (sometimes the pale part is rather broad), covered by 

 numerous, long, branched black rhizinae. 40 — 80 ,<< thick at 

 their base. 



Thallus covered by a colourless, very insperse, 8 — 22 /< thick 

 stratum, which forms the pruina. Upper cortex 10 — 45, usually 20—30// 

 thick. It is not plectenchymatous, its hyphae are very entangled, more or 

 less perpendicular to the surface, they are constrictedly septate and have 

 a relatively thick cell wall. Gonidia crowded in glomeruli sometimes onl}^ 

 covered by the amorphous stratum, usually deeper in the thallus. Medulla 

 white, 100 — 160 f.L thick. Lower cortex black or brownish-black, 25 — 

 40 a thick. 



Apothecia are not frequent. They are sessile, scattered and orbicular 

 with a diam. of 3—5 mm., sometimes crowded and angulose. Margin 

 thick persistent, entire or crenate, frequently with folioli which are some- 

 times so numerous and long that the apothecia look immersed in the thal- 

 lus. Receptacle about the centre black, its cortex 200 — 220/« thick, paler 

 and much thinner at the circumference, built of pachydermatous hyphae 

 perpendicular to the surface. Gonidia crowded in the margin of the apo- 

 thecia within the thin cortex, few and scattered in the medulla, absent 

 within the black cortex. Disc plane, black, more or less pruinose. Hypo- 

 thecium pale, 20 — 50// thick. Hymenium 100 — 140// thick, at the exterior 

 part more or less dark brown, very insperse, otherwise uncoloured and 

 not insperse. Paraphyses at their ends always clavately incrassate (4 — 5//) 



