252 Prof. Dr. C. Mereschkovsky's Diagnoses 



Forma tuberosa, Mer. 



Meresclikovsky, Beitr. z. Kenntn, d. Flecht, Um^eb. v. lieval, Kazan, 

 1909; id. Contrib. fl. lich. envir. Kazan, Hedwigia, 1919, p. 199, 

 tab. ii. fig. 1. 



Thallus rosulas parvas, 2-3 centim. (usque ad 4'5 centim.) latas 

 formans, compactus, laciniis brevibus, late-rotundatis, circiter 

 4 millim. latis, concretis, subimbricatis, centre irregulariter 

 tuberosus. 



Spec. orig. (numeros.) in herb, nieo Kazan! . 

 Rossia Media ; Esthlandia*. 



Parmelia taurica, Mer. 



Merescbkovsky, Scbedulse ad Licli. Rossise exsiccatos, Kazan, 1913; 

 id. Contrib. fl. licb^n. Crimee, Ann. d. sc. nat. Botanique, 1921 (cum 



Thallus liberus, circiter 2*5-3*5 (l"5-5) centim. lutus, plus minus 

 compressus, parce irregulariterque ramosus, fuscus, opacus, 

 utrinque similis, interdum ad apicem solum ambi lateris sub- 

 inselibus; suporficie insequaliter subplicato-rugosus, neque soredio- 

 sus, nee isidiosus ; laciniis circiter 0-5 millim. latis, subteretis 

 vel tereti-corapressis, apicibus ssepe breviter bifurcatis, rhizimis 

 omnino destitutus. Semper sterilis. 



Spec. orig. (1) in herb, meo Kazan i, (2) in Merescbkovsky, 

 Lich. Ross. exs. no. 7. 



Tauria et in steppas Kirgisorum. 



Forma congesta^ Mer. 



Merescbkovsky, Contrib. fl. lich^uol. d. 1. Crimea, in Ann. d. sc. nat. 

 Botanique, 1921 (cum fig.). 



Thallus minor, circiter 1*5-2 centim. (0'7-2"6 centim.), cougestus, 

 verrucoso- vel granuloso-perrugatus, ambitu lobis discretis desti- 

 tutus vel parce sparsim abbreviatis. 



Spec. orig. (numeros.) in herb, meo Kazani. 

 Tauria. 



Parmelia vagans, forma elegans, Mer. 



Merescbkovsky, Scbedul. ad Lich. Rossise exsiccatos, Kazan, 1913 

 (no. 58). 



Thallo minore, subtus uigro, laciniis angustioribus, marginibus 

 magis revolutis, ssepe conniventibus a forma typica dilFert. 



* The forma/a/v'?jos«, Mer., which I have described in ' Hedwigia,' 

 1919, p. 198, is nothing else but the \(iv. pfuinosa, Harm. (' Lichens de 

 France,' p. 567). 



