56 BERNT LYNGE. M.-N. Kl. 



Ex sic. ANZI Lang. 54 B, ANZI Lich. Ven. 21, ARNOLD 64 a, HEPP 



875, SCHAER. 486. 



Thallus 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. Thallus 

 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 (.1 thick at 

 their base. 



Thallus covered by a colourless, very insperse, 8 22 (.1 thick 

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

 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 only 

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

 white, 100 160 /LI thick. Lower cortex black or brownish-black, 25 

 40/4 thick. 



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

 with a diam. of 35 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 200 220/4 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/<) 



