Name: Omphalotus illudens (Schwein.) Bresinsky & Besl
Most Confident Observations:
Copyright © 2009 effdub
Copyright © 2016 Mike369
Copyright © 2010 Martin Livezey (MLivezey)
Copyright © 2009 kate (kate)
Version: 8
Previous Version 

First person to use this name on MO: Nathan Wilson
Editors: Michael Wood


Rank: Species

Status: Accepted

Name: Omphalotus illudens

ICN Identifier: missing

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Author: (Schwein.) Bresinsky & Besl

Citation: Beih. Sydowia 8: 106. 1979.


Domain: Eukarya

Kingdom: Fungi

Phylum: Basidiomycota

Class: Agaricomycetes

Order: Agaricales

Family: Omphalotaceae

Genus: Omphalotus

Notes on Taxonomy: [Edit]

Kirchmair et al. (2004) “Phylogeny of the Genus Omphalotus Based on Nuclear Ribosomal DNA-Sequences” Mycologia 96(6):1253-60 provides very compelling evidence that Omphalotus illudens is distinct from Omphalotus olearius based on both sequence data and mating studies. The samples they use for O. olearius all come from southern Europe. O. illudens, on the other hand, was described from the US and samples used in the paper came from the US and northern Europe. Regarding morphological differences " The above paper says: “Kirchmair et al (2002) said that O. illudens can be distinguished from O. olearius by smaller spores and an umbonate pileus”.

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Clearly two species
By: Michael Wood (mykoweb)
2010-08-17 11:00:02 PDT (-0700)

Robert Sasata is correct, there are clearly two species here. Besides the Kirchmair et al paper he sites, also see:

Kirchmair, M., Pöder, R., Huber, C.G. & Miller Jr., O.K. (2002). Chemotaxonomical and morphological observations in the genus Omphalotus (Omphalotaceae). Persoonia 17(4): 583-600.

Different species
By: Robert Sasata (Sasata)
2010-05-26 08:44:49 PDT (-0700)

This was discussed in Kirchmair et al. (2004) “Phylogeny of the Genus Omphalotus Based on Nuclear Ribosomal DNA-Sequences” Mycologia 96(6):1253-60. Phylogenetic analysis clearly shows they are different species, despite the outdated opinions of some authors, who could not even agree on the characters that separated the two.

By: Erin Page Blanchard (CureCat)
2010-05-26 07:51:30 PDT (-0700)

Hmm, I am not sure if the two names represent different taxa (O. olearius is a European name, while O. illudens is an Eastern North American name), or if they are synonyms; in which case I wonder which is given presidence.

IndexFungorum still has the two taxa split, and Agaricus olearius was described in 1815, while Agaricus illudens was described in 1822.

So if they are synonymous, I would like to hear the argument for why the older epithet (O. olearius) should be deprecated in favour of O. illudens.

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