Observation 89590: Arrhenia sphagnicola (Berk.) Redhead, Lutzoni, Moncalvo & Vilgalys
When: 2006-08-06
No herbarium specimen

Notes: Growing in Sphagnum

Proposed Names

35% (3)
Eye3 Eyes3
Recognized by sight: new name for Omphalina oniscus var. fusconigra
2% (2)
Recognized by sight: syn. Omphalina oniscus var. fusconigra (P.D. Orton) Krieglst.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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I have been trying
By: Irene Andersson (irenea)
2012-03-18 05:32:09 PDT (-0700)

to dig up original descriptions..

Orton’s fusconigra:

Peck’s gerardiana:

Berkeley’s sphagnicola: can’t find any online

Anyway, Orton’s original description of fusconigra is surprisingly detailed, similar to Moser’s, and very different from this observation.

Peck’s gerardiana is not that detailed – not like fusconigra – might be interpreted like sphagnicola usually is described..?

My conclusion is that both MycoBank and IndexFungorum can be mistaken about the synonyms, and I have to share the opinion in Funga Nordica, that fusconigra is separate from sphagnicola/gerardiana.
Another question is if sphagnicola and gerardiana really are the same, but it’s not impossible.

The only descriptions I have
By: Irene Andersson (irenea)
2012-03-18 03:24:04 PDT (-0700)

of species with scaly caps are of gerardiana and philonotis (pale scales and deeply funnelshaped cap on the latter).

In Moser’s key, there are two species with scales, philonotis with darker and more crowded gills, and sphagnicola, the latter with the most protruding scales and a paler stem. Omphalina fusconigra is described with very dark sepiabrown cap and stem, the middle of the cap “kleiig-flockig”. If his interpretation of the latter species is korrect, it’s hardly the same as sphagnicola. I’m adding an obs of what I think is what Moser’s meant by fusconigra. Obs 89903.

According to Funga Nordica, sphagnicola is a synonym to gerardiana.
O. fusconigra is just included in onisca(not a synonym), descibed with a smooth to innately fibrillose, dark grey brown to blackish brown cap.
IndexFungorum has sphagnicola, gerardiana, and onisca var. fusconigra as synonyms, and has chosen the name sphagnicola as the current name.

I was mistaken about MycoBank, they separate sphagnicola from gerardiana/fusconigra.

A bit messy, I can’t find further information on any conclusions about synonyms either..

Andreas, if gerardiana has the bigger spores, which is the one with smaller spores?

I don’t know
By: Andreas (AK_CCM)
2012-03-18 01:03:40 PDT (-0700)

how to divide the two taxa without the spore size because A. gerardiana has the bigger ones. I think this is A. onisca var. fusconigra. But it’s possible that the closely related A. gerardiana also could have a form with brown lamellae edges.

You are both right
By: Irene Andersson (irenea)
2012-03-18 00:24:18 PDT (-0700)

I once learned this species as Omphalina philonotis, apparently by wrong interpretations in my old books.

I checked Funga Nordica, and Arrhenia gerardiana (Peck) Elborne comb. nov. is definitely a better match – and both sphagnicola and oniscus var. fusconigra are synonyms according to MycoBank: http://www.mycobank.org/MycoTaxo.aspx?Link=T&Rec=302017 I don’t know why it’s still named Omphalina gerardiana there.

Thanks, Andreas and Debbie, for the correction!

By: Andreas (AK_CCM)
2012-03-17 23:53:35 PDT (-0700)

where I could get the information that A. sphagnicola is O. oniscus var. fusconigra? I couldn’t find anything in the paper with the combination from A. sphagnicola to Arrhenia:

Redhead et al. (2002): Phylogeny of agarics: partial systematics solutions for core omphalinoid genera in the Agaricales (euagarics). Mycotaxon 83: 19-57.


I think this could be O. oniscus var. fusconigra because of the sphagnum moss habitat, the more greyish than only brown cap color, the more or less squamose cap surface and the brownish lamellae edges. But this is no secure determination.

how would one separate these two species from a photo only?
By: Debbie Viess (amanitarita)
2012-03-17 16:36:53 PDT (-0700)

I am leaning towards philonotis, since descriptions say that this one can be gray capped as well as brown.

Lovely shot of a beautiful and delicate moss-dweller, at any rate, regardless of that final species designation.

Created: 2012-03-17 10:37:17 PDT (-0700)
Last modified: 2012-03-18 14:15:24 PDT (-0700)
Viewed: 357 times, last viewed: 2016-10-23 07:59:43 PDT (-0700)
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