243 Prof. Dr. C. Mereschkovsky's Diagnoses 



Spec, oricj. (numevos.) iti heib. nieo Kazani. 

 Esthlandia, Reval. 



RamaUna popu^iua, forma Jaxiuscula, Mer. 



Meresclikovsky, Nachtrag zur Flechtenl. Umgeg. Revals, Kazan, 1913 ; 

 id. Contrib.'fl. lich. Crim4e, Ann. d. Sc. nat. Botaniqiie, 1921 (cum 

 fig-)- 

 Thallus ut in typo, seel laciuiis magis laxiusculo dispositis. 



Spec, ori'ff. in lierb. nieo Kazani. 

 Estlilanciia, Tauria. 



Evernia tkamnodes, forma furfnrascens^ Mer. 

 Mereschkovsk}', Contrib. fl. lich. envir. Kazan, Hedwigia, 1919, p. 193. 



Thallns obscurior, cyanesceiite-viridis, dense isidiis elongatis sore- 

 diosisque omnino obtectus. 



Spec. oriy. (iiumeros.) in herb, nieo Kazani. 

 Kazan (Rossia Media). 



Forma parva, ^ler. 



Mereschkovsky, Contrib. lich. gouv. Vladimir, Arbeit. (Trudy) d. 

 Naturforschges. Univ. Kasan, 1911 ; etiam in Hedwigia, 19J 9, p. 193. 



Thallus parvus, altitudine circiter 1-2 centim. 



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

 A form analogous with the forma mimitissima, Mer., of 

 Usnea Jihta, with which it is often associated. 

 Kossia Media. 



Forma suhnucla, Mer. 

 Mereschkovsky, Contrib. fl. Hch. envir. Kazan, Hedwigia, 1919, p. 193, 

 Thallus Isetior, stramioeus, levis, esorediosus vel vix sorediosus. 



Spec. orig. in herb, meo Kazani. 

 Comparanda cum forma esorediosa, Hue. 

 Rossia Media (Kazan) et Sibiria. 



Cetraria crispa, forma albinea, Mer. 

 Mereschkovsky, Addit. Lichenogr. Ross, i., Oest. Botan. Zeitschr. 1921. 



Thallus erectus vel suberectus, caespitosus, baud vel parce crispus, 

 albidus, subtus interdum passim albus, basin versus fulvescens. 



Spec. orig. in herb, nuo Kazani. 

 Sibiria. 



