40 BERNT LYNGE. M.-N. Kl. 



Thallus growing in small rosettes, diam. up to 4 cm., rosettes often 

 confluent, covering larger areas. Laciniae at the circumference slightly 

 appressed, otherwise more or less ascending or protruding, short, 

 narrow (narrower and more diffuse than in Ph.ascendens), flat or somewhat 

 convex, multifid, repeatedly furcate, incise or lacerate. Thallus without 

 isidia. Laciniae at their apices incurved or even revoluteand 

 on the (morphological) lower side densely sorediate. Laciniae 

 along the margin clothed with long unbranched or branched 

 cilia of the same colour as the thallus, or slightly darkened 

 at their apices. Thallus of a white or greyish-white colour, moistened 

 greenish, lower side white or greyish, surface opaque or rarely with a 

 faint lustre; thallus not translucent. 



Upper cortex 25 30 ( 40) /* thick, uncoloured, or especiall}' at the 

 exterior part, greyish. Hyphae indistinct, 5 6 (.1 thick, perpendicular to 

 the surface, thin-walled, constrictedly septate. Surface sometimes papilla- 

 ceous from hyphae which grow forth. Gonidia crowded, diam. 12 14 u. 

 Medulla white. Lower cortex uncoloured, 25 50 /n thick, hyphae chiefly 

 parallel to the surface. 



Thallus frequently fertile; apothecia orbicular, diam. 1,5 to 2 mm., 

 sessile or very shortly pedicellate. Margin thin, minutely crenate, but 

 inappendiculate, frequently sorediate. Receptacle of the same colour as 

 the thallus, rugose, without rhizinae. Cortex to 100 11 thick, hyphae 

 septate, closely contiguous, perpendicular to the surface. Gonidia crowded 

 in thick clusters within the cortex, few in the medulla and absent under 

 the hypothecium, large, diam. up to 22,11. Disc of young apothecia reddish- 

 brown, then black, moistened persistently reddish-brown, epruinose or 

 occasionally with a thin bluish pruina. Hypothecium up to 40/4 thick, unco- 

 loured or yellowish. Hymenium 65 80 a thick, with brown epithecium, other- 

 wise it is uncoloured. Paraphyses rather thick (2 b ), at their apices clava- 

 tely incrassate (3 4 ft) and constrictedly septate, usually unbranched, 

 occasionally branched towards the tips. Asci narrowly clavate, 5053/1 long, 

 14 18 f.i thick, octosporous. Spores obliquely biseriate, two-celled (or very 

 rarely four-celled), ellipsoidical, straight, rounded at the ends, slightly con- 

 stricted at the septum. Cell rooms small, rounded or angular. Colour 

 pale greyish brown, size varying only slightly: 14 18,5 /< long, 

 7,4 10 /< thick. 



Pycnides numerous, with protruding apices, oblong, 150 185 u high, 

 120 130/4 broad. Perifulcrum dark at the ostiolum, otherwise uncoloured. 

 Pycnoconidia straight, cylindrical, or slightly thickened at the middle, 

 3 4 in long. The pycnides are very frequently sterile. 



