Georgij Karlowitsch Kreyer (; November 26, 1887 – January 11, 1942) was a Russian and Soviet botanist and mycologist (lichenologist) born in Saint Petersburg.Science, "Deaths or Russian Botanists", 16 Feb 1945: Vol. 101, Issue 2616, pp. 166-167 p. 167
In academic publications, his name has been spelt variously Georgij Kalowic Kreyer, Georgij Karlowich Kreyer and (in Polish orthography) Georgij Karlowicz Kreyer. Between 1908 and 1910, he made extensive collections of lichens in the Mogilev Region of Belarus, between Orsha and Syanno, in the neighbourhood of the settlements of Smolyany, Bobromynichi (Vitebsk Region) and Selets.
Examples of names published Atropa caucasica Kreyer. (species now demoted to Atropa belladonna ssp. caucasica (Kreyer) Avet.)Missouri Bryological list; CMI; from letter by Dmitry Bochkov 06.01.2015 Kreyer is commemorated in the name of the plant species Valeriana kreyeriana Sumnev. in the genus Valeriana.Trav. Inst. Sc. Biol., Tomsk ii 51 1936 (IK).
Kreyer was the editor of the 1913 work on fungi Mycota (180 pages) reissued in 1915. This includes descriptions of the morphology of 190 species, many of which go into some detail concerning intraspecific variability and feature discussions of the differences between taxa linked by virtue of their morphology.
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