272 Prof. Dr. C. Mevesclikovsky's Diaf/noses 



Var. halophiluSj Mer. 



Thallus major et crassior quam in var. caspico, Mer., circiter 3-5 

 centim. altus vel plus, pallidus, livido-lutescens vel livido- 

 albesceus, cartilagineus, subtus coiicolor, nervoso-reticulatus, 

 arbusculos ramosos formaus, laciniis subdichotomice divisis et 

 subdivisis, compressis, planis vel leviter canaliculatis, circiter 

 2-3 millim. latis, sublinearibus vel apicem versus paullum dila- 

 tatis, plus minusve furfuraceo-rugosis praesertim apicem versus. 

 Semper sterilis. 



S/iec. orig, in herb, meo Kazan i. 



Gubernia Astrachan. Asia Media (Djungaria). 



Xanthoria pariedna, var. adpressa, Mer. 



Mereschkovsky, Schedulse ad Lich. Ross, exaiccatos, Kazan, 1913 ; vide 

 etiam Hedwigia, 1919, p. 209. 



Thallus rosulas usque ad 1 decim. formans, teuuior ut in typo, arete 

 ad substratum adpressus, lobis vulgo paullulum angustioribus. 

 Ad corticem arborum. 



Spec. orig. (1) in herb, ineo Kazani, (2) in Mereschkovsk\-, 

 Lieli. Koss. exs. no. 40. 



Rossia Media. Esthlandia. Tauria. Gallia. Austria. 

 Helvetia. 



Var. aureola, forma isi'HotgIa, Mer. 



Thallus aureo-aurantiacus, centro minute papillato-isidiusus ; apu- 

 thecia magna, margine isidiis brevibus oruato. Ad trubes. 



Spec. orig. in lierb. Conservat. botan. GenevEe (a Leveilld 

 in Tauria lectum). 



Tauria. 



It is possibly the same as the var. isidioidea (Belts.), Zahlbr., 

 which, however, cannot be ascertained without a comparison 

 with tlie original specimen of the latter. 



The following is a list of all known European forms of 

 Xanthoria parielina : — 



1. Xanthoria par ietina (L.), Th. Fr., type. 



2. , forma aurata (Mass.), Lich. ital. exs. no. 33. 



3. , forma chlorina (Chev.), Oliv. Mereschk. LicL. tic. 



exs. no. 83. 

 4. , forma cinerascens (Leight.), Sandst. Crombie Brit. 



Lich. i. p. 298. 



6. , forma dispersa, Oliv. Bull. Soc. bot. d. Fr. 1894, p. 94. 



6, , forma imbricata (Mass.), Zahbr. Crypt, exs. no. 1979, 



