Lichenes Florae Eossiae et regionum confinium orientalium. 37 



medulla dilute lutescens, tamen jam habitus thallinus Phys- 

 ciae aipoliae bonum discrimen a Ph. stellari praebet, 

 quod his verbis a eel. Wainio (Lich. Viburg. pag. 52) describitur: 

 „thallus Ph. aipoliae crassior, quam Ph. stellar is, et 

 color Ph. caesiae similior. In form a typica apothecia demum 

 majora, quam Ph. s t e 1 1 a r i s, semper caesio-pruinosa et mar- 

 gine crasso. Thalus subtus rhizinis nigris". Nostra specimina 

 ad exs. Florae (Deutsch. Lich. n° 135) omnio quadrant et ad 

 f. acrita (Ach.) pertinent. Conf. Xt/Iander, Lich. Scand. 

 pag. ill. 



89. Physcia pulverulenta (Schreb.) Nyl. 



Synops. lich. I (i860) pag. 419; Lich. Scand. pag. 109; Th. Fr., 

 Lich. Scand. pag. 136; Wain., Adj. lich. Lapp. I pay. I'M: Lich. Sib. Merid. 

 pag. 14; Lichen, e Caucasu cd e peniiis. Taur. pay. 3n] (pr. p.);— Lie hen 



Var. allochroa (Ehrh.) Th. Fr. 



pulverulenta Ach., Meth. pag. 2U>: Lii-h. I uiv. pay. 473: Syn. pag. 

 214;— P h y s c i a pulverulenta Xyl., Prodr. pag. 308- 



Icon.: Fl. Dan. Tab. 1719; Hoffm., PL lich. Tab. VIII. fig. 2; Beinke, 

 Abhandl. ttber Flecht. IV fig. 129. II. 



Exs.: Fr., Lich. Sue. n" 76: Moug. et Xestt. n" 162; FWrk., Lich. 

 Deutsch. n° 172: Funk.. Fiehtlyb. n° 100. 110; Dcs»i„:ihrs. n° 144: Leight., 

 Lich. Brit. n° 49; Nr/iarr.. Lich. Hclv. n" 376: #„/„■»/»., Lich. Eur. n u 96.187; 

 flejjp., Fl. Eur. n" s74: A/// ./ .Y,„,/.. Herb, lich. Fenn. n" 212 et n? 213 



Statio : ad corticem arborum frondosarum, praecipue Alno- 

 rum et Populorum, in sylvis prope: 



a) pagum Duderhof et b) Oranienbaum distr. Petropolitani 

 leg. Elenkin (1903). 



c) prope Vladicaucas in Caucaso . leg. Elenkin (1899). 



d) prope Kriukovo (gub. Mosqua) leg. Elenkin (1903). 

 Obs. Specimina a et c thallo opaco, cinereo-pruinoso ad 



t'ormam typicam var. allochroa pertinent; specimina b su- 

 perficie thallina nuda differunt et pro parte f. deters a 

 Nyl, Synops. pag. 420, Lich. Scand. pag. 110 (Parmelia 



