+ 
103 
circa pollicaris) suborbiculari adnato, sorediis verrucoso-prominulis al- 
bidis vel fusco-albidis adsperso; supra saxa rarius. — P. ryssolea (Ach.) 
Nyl. Syn. p. 405 (quam e Tauria et aliunde e Rossia vidi) affinis, sed 
evernioidea, attamen forte non bona species; sit saxicola. 
11. P. stygia (L.) Ach., Nyl. Syn. p. 405. 
Thallus castaneo-fuscus nitidiusculus orbicularis mediocris 
(latit. 2—3-pollicaris) firmulus, laciniis sublinearibus multifidis 
planis vel convexiusculis imbricatis divisus, subtus niger (vel 
ambitu spadiceus) fibrillis rhizineis parcis; apothecia fusca 
latit. 3—8 millim.), margine receptaculari crenato cincta. 
Supra rupes in terris Scandinavicis et arcticis frequens, 
12. P. lanata (L.) Nyl. Syn. p. 406. 
Thallus nigricans vel fusco-nigricans teres gracilis decum- 
bens vage ramosus implexus, fere nitidiusculus; apothecia 
lateralia concoloria, margine receptaculari subintegro aut fere 
granulato-inequali; spore fere ut in stygia vel prolixa. 
— Supra rupes Scandinavie frequens. 
Thallo filiformi alectorioideo ab aliis congeneribus recedit; at thallus 
interdum (presertim in alpinis) nisum dispositionis orbicularis (laciniis 
ilice teretibus radiantibus) ostendit, et py digg cingens sXpe 
crenulato-undulatus affinitatem indicare videt m P. stygia, quacum 
colore convenit, at textura strati corticalis hällt a diversa. 
ske Sirpa Parmelize  lyssdlk Thallus subtus glaber. — Species 13—15. 
13. P. physodes (L.) Ach., Nyl. Syn. p. 408. 
Thallus albidus substellatus mediocris vel majusculus, laci- 
niis multifidis planiusculis glabris lxevibus imbricatis, subtus 
fusco-niger nudus rugosus et apicibus (sepe subadscendentibus) 
honnihil ibi inflatus et badio-pallescens; apothecia spadicea 
vel badio-rufescentia mediocria (latit. 3—6 millim.), margine 
Cincta receptaculari Rs spore 8" parve (longit. 0, 006—38, 
erassit; 0,005—& m 
gön Saxa et ad Haalos arborum frequens, at sat raro fer- 
Haud Parum väriabilis. Var. vittata Ach. lacinias thalli habet magis 
Ma. RR Margine externo obscuratas vel denigratas. Var. platyphylla 
i 
a typo laciniis latioribus, ambitu crenatis. Variat etiam 
