258 Prof. Dr. C. Mereschkovbky's Diagnoses 



Lecanora clilarona, forma albinea, Mer. 

 Mereschkovsky, Mat^r. p. une Monogr. d. genre Lecanora. 



Thallus determinatus vel subeffusus, crapsiusculus vel sat crassus, 

 gramiloso-verrucosus, hand pulveruleutus, lacleo-albus, colore 

 griseo vel glaucescente (ut plus minus in typo videtur) omniiio 

 destitutus ; apothecia media, circiter 1 (usque ad 1-3) millira. 

 lata, parum elevata vel eubapplanata, subeonferta vel contigua, 

 interdum mutuo pressione subangulosa, disco planiusciilo vel 

 couvexiusculo, brunneo vel rufo-fusco (ut in forma applanata, 

 Mer.), nudo, margine thallode mediocre, parum vel vix discum 

 superante, distincte miuuteque granulato-crenulato. 



Spec. orig. (1) iti lierb, Coii=ervat. botan. Genevse (vide 

 Tabulas Lecaimrfe chlaronce), (2) in herb. Brir. Mus. 

 Lugano (Helvetia italica). 



Forma applanata^ jMer. 



Mereschkovsky, I. c. 



Thallus indeterminatus, sat tenuis, crassitudine ut in forma typioa, 

 ambitu in hypothallo albo evauescens, granulosus, albidus (simul 

 ut in forma albinea), in herbario tempore sordide lutescens ; 

 apothecia mediocria, vulgo 0-8-1 -3 (usque ad 1-5) millim. lata, 

 orbicularia, numerosissima, conferta, sed baud compressa, nee 

 angulosa, plana et arete adnata, quasi adpressa, una altera baud 

 Ruperantes, disco piano (statu juvenili concaviusculo), rufo-fusco 

 vel Ifete brunneolo (couleur de cuir), nudo ; margine mediocri 

 vel subtenui (ut in forma typica), disco parum superante, albo 

 (thallo concolore), tenuiter, distincte regulariterque grauulato- 

 crenulato (valdedistinctior quam in Lich. ticin, exs. no, 14 et 15). 



Spec. orig. (1) in herb. Conservat. botan. Genevse (vide 

 Tabulas Lccanone c/daronce), (2) in herb. Brit. Mus. 



Forma griseola, Mer. 



Mereschkevsky, /. c. 



Thallus bene evolutue, baud albus ; apotheciis dense griseo-pruinosis, 

 disco rugoso. 



Spec. orig. in herb, meo Kazaui. 

 Austria Inferior. 



Forma pallescens, Mer. 

 Mereschkovsky, I. c. 

 Thallus subevanescens, albus ; apotheciis pallide testaceis, saepe 

 subdifformibus, margine tenui, albo, minute granulato-crenulato. 



