262 Prof. Dr. C. Mereschkovsky's Diagnoses 



Lecanora dispersa, forma obscura, Mer. 



Merescbkovskv, Beitr. z. Kenntn. d. Flecht. Umgd. t. Reval, Kazan, 

 1909. 



Apotheciis obscurioribua. 



Spec. orig. in herb, meo Kazaiii. 

 Eathlandia : Reval. 



Lecanora elenkmii^ Mer. 



MereschkoTsky, Scliedulae ad Lich. Ross, exaiccatos (no. 31), Kazan, 

 1913; id. Contrib. fl. lichen, d. 1. Crimee, Ann. d. sc. nat. Bo- 

 tanique, 1921. 



Thallus tenuis, parum evolutus, lutescente-albidus ; apothecia media 

 vel submedia vel mediocria, elevata, margine concolore, tumido, 

 discum valde superante, involuto, disco piano vel concaviusculo. 



Spec. orig. (1) in herb, meo Kazani, (2) in Meresclikovskj, 

 Lich. Rossiai exs. no. 31, (3) in ejusdeni Tabulze Generum 

 Lichenum (1913), Lecanora, i. no. 29 (e Tauria). 



Tauria. 



Forma albinea, Mer. 



Mereschkovsky, Contrib. fl. licb^nol. Crim^e, Ann. d. sc. nat. Bo- 

 tauique, 1921. 



Thallo et margine apotheciorum albo ; thallo pulverulento. 



Spec. orig. (1) in herb, meo Kazani, (2) in Mereschkovsky, 

 TabulsB Generum Lichenum (1913), Lecanora, i. no. 30 

 (e Tauria : Sint'eropolis) . 



Tauria. Austria meridionalis ! 



Lecanora gangaleoides, forma ornata, Mer. 



Mereschkovsky, Tabulae Generum Lichenum, Kazan, 1913, Lecanora, 

 ii. no. 52 (ex Gallia, Docelles (Vosges)). 



Apotheciis foliolis thallinis oruatis. Est forma potentialis (vide 

 Hedwigia, 1919, p. 206). 



Spec. orig. in herb, meo Kazani. 



Forma plmnhea, Mer. 

 Mereschkovsky, I. c. no. 63 (e Gallia, Docelles (Vosges)). 

 Thallo plumbeo. 



Spec. orig. in herb, meo Kazani ; vide etiam in Tab. Gen. 

 Lich. no. 53. 



Gullia : Docelles (Vosges). 



