LICHENES — DR JEAN MULLER. 355 



5. PHYSCIA. 



Physcia, Th. Fries Arct. 60 ; Heterol. 59 ; Tuck. Gen. 24. 

 Physcia, Nyl. Syn. 406, pr. p.; Stitz. Beitr. loc. cit. pr. p. 

 Parmelia, Ach. pr. p. 



A widely dispersed genus of all regions, with generally very common species. 



1. P. leucomelas, Michx. Flor. Bor. Amer. 2, p. 326. 



Socotra. In ramulis Rhoidis supra Kischen, alt. 1000 m. 

 Schweinf. 



Distrib. Very common in the warmer regions of the globe, and also 

 observed in west temperate Europe. 



2. P. speciosa, Nyl. Syn. p. 416, f. sorediifera, Nyl. 



Socotra. Ad saxa granitica supra Wadi Kischen, alt. 1000 m. (sterilis). 

 Schweinf. 



Distrib. Like the preceding, but less rare in Europe. 



3. P. crispa, Nyl. Syn. p. 423. 



Socotra. Ad saxa quartzosa ad Wadi Kischen, alt. 650 m. Schweinf. 

 Distrib. In all warmer regions ; not so common as the two preceding 

 species; usually corticole. 



4. P. obsessa, Nyl. Syn. p. 426. 



Socotra. Ramulicola supra Wadi Kischen, alt. 600 m. (sterilis). Schweinf. 

 Distrib. Common in warmer regions. 



5. P. obscurella, Mull. Arg. in Proc. Roy. Soc. Edin. xi. (1882), 459. 



Similis Ph. adglutinatce, sed minor, lacinise \— ^ mm. latae, discrete, adplanatae, adpressae, 

 incisae, obscure olivaceo-virentes, subtus pallidas et rudimentarie rhizinosae, margine 

 nudae. Apothecia valde minuta, discus fuscus, margo cum thallo concolor et integer; 

 epithecium fuscum; lamina et hypothecium hyaliua. Asci 8-spori. Sporae 12-15 fi tantum 

 longse, 7-8 fi latse, caeterum iis congenerum couformes. 



Quasi medium tenet inter Ph. affixam, Nyl. ap. Cromb. (Lich. Cap. p. 170) et Ph. disjunctam, 

 Krplb. (Beitr. Afr. p. 141). Sporae minores quam in Ph. adglutinata et tota planta tenuior. 



Socotra. Ad saxa quartzosa ad Wadi Kischen, alt. 650 m. Schweinf. 

 Distrib. Endemic. 



var. fusca, Mull. Arg. in Proc. Eoy. Soc. Edin. xi. (1882), 459. 

 Eadem sed thallo olivaceo-fusco distincta. 



