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According to our data Hebeloma petrakii is not the name of a current valid species of Hebeloma. Our database has records for the following similar names
Full name: Hebeloma petrakii Hruby ex. Singer (1951) ["1949"]
Published: The Agaricales in Modern Taxonomy 22: 538 (1951) ["1949"]
Taxonomic status: Heterotypic synonym of H. mesophaeum
Notes: Nom. inval. (Art. 38.1(a) - Shenzhen). No record has been found of this ever having been validly published by Hruby. Hence Singer's recombination into Hebeloma is also invalid.

Types: CZECH REPUBLIC: Moravia, Brno (approx. 49.187°N, 16.63°E, alt. approx. 200 m a.s.l.), Nov. 1927, J. Hruby (Lectotype. herbarium acc. no. E00456371, HJB1000590).

These syntypes appear to be original material, annotated in both cases by Hruby. Almost certainly the material at FH was that studied by Singer. It appears that this species was never published and hence no material was ever selected as type.

Diagnosis: Not found.

Commentary: Original material of H. petrakii, described from Europe, was discovered on a visit to the Farlow Herbarium at Harvard. The material was annotated, almost certainly by J. Hruby himself, as “Naucoria petrakii Hruby n. spec. Moravia, Brno, Nov 1927, leg. J. Hruby”. We, as others before us, have not been able to find any publication including this name and thus assume it has not been published. As a consequence, Singer’s (1951 [“1949”]) recombination into Hebeloma, not accompanied by a description and or type, is invalid, too. The material discovered at Farlow is conspecific with H. mesophaeum. Hence this is: = Hebeloma mesophaeum (Pers.) Quél.

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