Observation 81108: Ischnoderma benzoinum (Wahlenb.) P. Karst.

When: 2011-10-06

Collection location: Cook Forest State Park, Pennsylvania, USA [Click for map]

Who: walt sturgeon (Mycowalt)

No specimen available

On conifer log.

Proposed Names

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Thanks all.
By: walt sturgeon (Mycowalt)
2011-11-01 07:59:59 MST (-0700)
A few DNA sequences available
By: Irene Andersson (irenea)
2011-11-01 06:29:28 MST (-0700)

I found 5 european, and they all showed the same 12 different base pairs in the ITS region between resinosum and benzoinum. That is quite a lot in that region. One had been named resinosum, the rest benzoinum, but one of the latter had been growing on beech, and was a perfect match with the other resinosum. Couldn’t find any american ones, that’s a pity..

Thanks all for the very interesting discussion!
By: Andreas (AK_CCM)
2011-11-01 01:20:51 MST (-0700)

Thank you for the citation from “North American Polypores”.

The authors of “European Polypores” refer to

  • David, A., M. Tortic & B. Dequatre (1983): Characteres myceliens et affinites entre les genres Podofomes Pouzar, Datronia Donk et Ischnoderma Karst. (Polyporaceae). Bull. Soc. Mycol. France. 99: 361-371.

But I was wondering about the notice of the authors which Drew cites because “North American Polypores” were published in 1986 and 1987 – three years after the publication of David et al. The only reason I see is that the european taxa differs from the american taxa.

I didn’t found I. resinosum yet so I couldn’t say anything about the smell.

Mating tests
By: Irene Andersson (irenea)
2011-11-01 00:07:41 MST (-0700)

have shown that the two european taxa, benzoinum (conifer), and resinosum (hardwood) are intersterile, not necessarily shown in a DNA test. These two could be slightly different from the american forms as well.

Anyway, I have sensed the smell of anise in benzoinum – but not everytime.

By: Drew Parker (mycotrope)
2011-10-31 20:21:13 MST (-0700)

Information is from Gilbertson and Ryvarden – “North American Polypores, Fungiflora”. In remarks under Ischnoderma as follows.

“In Europe often two species are recognized, one mostly confined to conifers (I. benzoinum (Wahlb.:Fr.) Karst.) and one mostly on broadleaved trees (I. resinosum s. str.). They are separated on the context color being ochraceous to brown in the former, whitish to wood-colored in the latter. The difference is marginal and as specimens collected from coniferous substrate do not differ in cultural characteristics from those collected on hardwoods, we prefer to look upon them as forms of the same species.”

Christian, that is interesting that it says there is no odor for this in B&K. I hadn’t noticed that. In my area I have only found it on conifers (I. benzoinum), and I can attest that the odor is strong. It’s host wood is supposed to smell like anise according to G&R, but they don’t mention an odor for the sporocarp.

I recently had a conversation about this
By: Christian (Christian Schwarz)
2011-10-31 19:15:20 MST (-0700)

One odd thing that stood out to me was that I. benzoinum seems to be named for an odor (benzaldehyde smells like almonds) – but Fungi of Switzerland describes it as ‘without odor’.

This contrasts with the material of I. resinosum I’ve seen in Washington and northeastern CA, which smells very strongly not of almonds but of anise (I brought an old specimen into a room and two people sitting inside immediately noticed).

I. benzoinum vs. I. resinosum
By: Andreas (AK_CCM)
2011-10-31 19:14:13 MST (-0700)

Where do you get this information? Because L. Ryvarden and R.L. Gilbertson differ the two species in their work “European Polypores, Fungiflora/ Oslo (Sweden)” as follows:

  • Trama and context dark brown in the late, hard fomitoid phase; on conifers: I. benzoinum
  • Trama and context whitish to pale dirty yellowish; context even pale brown near the base in the late, hard fomitoid phase; on hardwoods: I. resinosum

I think we should differ the taxa until there will be mulecular results that the species are conspecific.

I. benzoinum
By: Drew Parker (mycotrope)
2011-10-31 13:28:05 MST (-0700)

Mycologists differ over whether I. resinosum and I. benzoinum are separate species. Gilbertson thinks there are not enough differences to separate them and considers them two forms of the same thing (resinosum). I know Index Fungorum considers the two names legitimate, but I thought I would put this out there. I haven’t heard of any molecular work done on the question.

Created: 2011-10-31 07:44:24 MST (-0700)
Last modified: 2011-10-31 13:01:35 MST (-0700)
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