Observation 130306: Stereum insignitum Quel.
When: 2011-08-02
(46.3425° 13.5306° 415m)
No herbarium specimen

Notes: Code Bot_539/2011_DSC8900

Habitat: Almost flat terrain, broadleaf forest with individual Picea abies, flysh ground, quite humid and warm place, mostly in shade, partly protected from direct rain by tree canopies, average precipitations ~ 3.000 mm/year, average temperature 8-10 deg C, elevation 415 m (1.350 feet), alpine phytogeographical region.

Substratum: dead, but still (half) standing trunk of a deciduous tree, possibly Acer sp..

Place: Bovec basin, next to the trail form Kanin cable car station A to Plužna village, East Julian Alps, Posočje, Slovenia EC

Comments: Growing in groups of many fruitbodies all over the trunk.

Nikon D700 / Nikkor Micro 105mm/f2.8

Proposed Names

21% (2)
Eye3
Recognized by sight
Used references: (1) R.Phillips, Mushrooms, Macmillan (2006), p 316.
(2) A.Bernicchia, S.P.Gorjon, Cortitiaceae s.i., Fungi Europaei Vol.12., Edizioni Candusso (2010), pp 636.
(3) G.J.Krieglsteiner (Hrsg.), Die Grosspilze Bade-Württembergs, Band 1, Ulmer (2000), p 334.
(4) D.Arora, Mushrooms Demystified, Ten Speed Press, Berkeley (1986), p 60
47% (2)
Recognized by sight
54% (1)
Eyes3
Recognized by sight

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Eye3 = Observer’s choice
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Comments

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Thanks for the link
By: Irene Andersson (irenea)
2013-03-18 10:54:27 PDT (-0700)

New to me, a very nice site!

And yes, now I beleive that it’s Stereum ostrea/insignitum you have there (S. ostrea should be the current name only if they are the same – ostrea was described from Java..).
The descriptions I have seen of subtomentosum have been both with and without a large resupinate part, but now I think that those descriptions include insignitum, and that is one way to separate them. What I call subtomentosum is common on Alnus, and usually has a very large resupinate part. S. insignitum(ostrea) was described to grow mainly on Fagus, but also on Acer and Ulmus.

I only have a lousy picture of our subtomentosum. Will post it anyway, but try to take some new ones when the snow is gone..

presence or absence of pseudoacantophysen would tell more
By: amadej trnkoczy (amadej)
2013-03-18 09:39:27 PDT (-0700)

I haven’t considered Stereum insignitum (S. ostrea in Slovenian checklist) although the measured spores fit well to it. Upper side of the brackets seems to me of too different color. Look at the http://aphyllopower.blogspot.com/... (I like this www very much). These brackets seem to be quite ‘uniformly’ brown (tobacco to cinnamon) compared to my observation. Bernicchia uses the simple term ‘brown’. Unfortunately, I haven’t scoped hymenium. Perhaps presence or absence of pseudoacantophysen would tell more. Next time… For me Stereum is not an easy genus to come down to species level. I have pictures of several other observations, which I don’t know where to put them.

Maybe more species involved after all
By: Irene Andersson (irenea)
2013-03-18 05:47:18 PDT (-0700)

Have you looked at insignitum (sp. 4.5-7(-8) x 2-3(-3.5) )?

It disturbs me that no author of any of the recent books you are mentioning have used the DNA tool…

spore width
By: amadej trnkoczy (amadej)
2013-03-18 02:02:53 PDT (-0700)

Re: #87721 Spore dimensions (width) do not support S. subtomentosum. A.Bernicchia, S.P.Gorjon, Cortitiaceae s.i., Fungi Europaei Vol.12., Edizioni Candusso (2010), pp 636/642 gives spore width 2-3.5 micr. for S. hirsutum and 2-2.5(3) micr. for S. subtomentosum. Measured spores fit much better to S. hirsutum. Compare also my observation #86455 of what I determined as Stereum subtomentosum. Width of the spores of this observation differs nicely from observation #87721 and fit well to Berniccia’s data. Also with #87721 I haven’t noticed any liquid when hymenophore was cut or injured, which speaks against S. subtomentosum but this could easily be the consequence of the fact that hymenophore were not very fresh when I photographed them.
Present observation (#130306) was not studied seriously. I just photographed the beautifully colored brackets. So, I can’t object your valuable opinion. Great similarity in appearance to the observation #87721 mislead me. Thanks again for your discussion.

Also #87721
By: Irene Andersson (irenea)
2013-03-17 13:21:39 PDT (-0700)

is subtomentosum if you ask me..

Compared to hirsutum, they are
less “hirsute”
too little yellow
and the reflexed part is too large, more than 3 cm

which traits?
By: amadej trnkoczy (amadej)
2013-03-17 12:57:23 PDT (-0700)

Thanks Irene for your alternative determination. Please, tell me which traits inclined you for it? Is this somehow fan shaped brackets? Please, compare my observation #87721. The silhouettes of the brackets are to some extent different there but both sides of the brackets of this observation fit very well to my last observation. Would you agree with that determination?

Created: 2013-03-17 03:47:04 PDT (-0700)
Last modified: 2013-03-18 11:03:37 PDT (-0700)
Viewed: 118 times, last viewed: 2016-10-26 09:06:25 PDT (-0700)
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