Observation 59089: Russula ochroleuca (Pers.) Fr.

When: 2010-08-07

Collection location: Mount Kobariski Stol ridge, East Julian Alps, Posočje, Slovenia [Click for map]

46.27603° 13.52196°

Who: amadej trnkoczy (amadej)

No specimen available

Code: Bot_444/2010_IMG1872

Habitat: Open mixed forest, flat terrain, under a Picea abies, among mosses and Picea needles; calcareous bedrock but possibly somewhat acid soil, fairly humid place, in total shade, partly protected from direct rain by tree canopies, average precipitations ~ 3.000 mm/year, average temperature 7-9 deg C, elevations 650 m (2.100 feet), alpine phytogeographical region.

Substratum: soil.

Place: West Hlevišče flats, north slopes of Mt. Kobariški Stoil ridge, East Julian Alps, Posočje, Slovenia EC

Comments: Growing solitary, pileus diameter about 7 cm (2.7 inch); flesh firm; SP light ocher; cap skin peeling easily.

Nikon D700 / Nikkor Micro 105mm/f2.8

[admin – Tue Feb 08 12:34:58 +0000 2011]: Changed location name from ‘Mount Kobariški Stol ridge, East Julian Alps, Posočje, Slovenia.’ to ‘Mount Kobariški Stol ridge, East Julian Alps, Posočje, Slovenia’

Proposed Names

20% (4)
Recognized by sight
Used references: (0) Personal communication. Id’ed by Mr. Anton Poler.
(1) R.M. Daehncke, 1200 Pilze in Farbfotos, AT Verlag (2009), p 850.
(2) M.Bon, Parey’s Buch der Pilze, Kosmos (2005), p 78.
(3) http://www.grzyby.pl/gatunki/Russula_ochroleuca.htm .
(4) http://www.rogersmushrooms.com/... .
(5) R.M. Daehncke, 1200 Pilze in Farbfotos, AT Verlag (2009), p 860.
(6) M.Bon, Parey’s Buch der Pilze, Kosmos (2005), p 56.
(7) R.Lueder, Grundkurs Pilzbestimmung, Quelle & Meyer (2008), p 177.
(8) http://www.grzyby.pl/gatunki/Russula_mustelina.htm .
Based on microscopic features: Spore dimensions: warty, 8.5 (SD = 0.5) x 7.2 (SD = 0.3) micr., Q = 1,2 (SD = 0.06), n = 30. Motic B2-211A, magnification 1.000 x, oil, in water.
Based on chemical features: Smell and taste mild, not burning.
60% (3)
Eye3 Eyes3
Recognized by sight

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Eye3 = Observer’s choice
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Add Comment
I understand your arguments
By: amadej trnkoczy (amadej)
2010-11-19 11:44:52 CET (+0100)

Thank you Irene again. I understand your arguments, which seem to me quite ‘heavy’. But you should understand me. This was my first Russula of this kind in my life, which means I have no field experience. So, I really cannot ‘decide’ on anything. Therefore I voted equally for both alternative identifications made by two experts which both have kindly helped me a lot to still my curiosity and which both I respect very much. I wouldn’t have anything against if you increase the certainty of your voting in such a way that we would not deceive others with a wrong identification.

By: Irene Andersson (irenea)
2010-11-19 09:40:51 CET (+0100)

I’d probably let it pass as a pale mustelina, if you hadn’t done such an excellent documentation of it :-)
It’s not only the cap colour, it’s also the stem that lacks the typical chambers that should have been present in the specimen you showed.
Check this site:

R. ochroleuca was also my first idea
By: amadej trnkoczy (amadej)
2010-11-18 19:55:34 CET (+0100)

Thank you Irene for your comment. R. ochroleuca was also my first idea based on pileus color (and Daehncke). But most of sources available to me state sharp taste although there is some contradiction among authors. Daehncke: ‘bitterlich’, Lueder: ‘mild bis leicht scharf’, Bon: ‘pikant bis scharf’, Pace: ’ mild but burning in gils’, Rothmaler, Excursionsflora von Deutschland 1., Niedere Pflanzen, Elsevier, p490: ‘deutlich scharf, seltener mild’, Poler: ‘distinctly burning ’. This was not the case with the mushroom found. It was mild. Admittedly I didn’t chew it very long. May be this was a mistake? Then I tried to clarify the situation with measuring spore dimensions. The result is on the published graph. This confused me even more. The discrepancies among authors are even greater. Then I sent pictures and other information to Mr. Anton Poler. He is no doubt an authority and the most productive writer about mushrooms in Slovenia. He id’ed the pictures as R. mustelina, not with certainty – therefore I put ‘Promising’ – based on mild taste, habitat and habitus. He also noted that the color of pileus is unusually pale color. But such color can be found for example in Lueder and on some Google sources (which can be easily questionable). Of cause, my limited mushroom experience doesn’t allow me to have my own opinion. Anyway, the mushroom was very beautiful. Thank you again.

Too pale cap,
By: Irene Andersson (irenea)
2010-11-17 22:42:25 CET (+0100)

and a non-chambered stem. It doesn’t look like mustelina to me, closer to ochroleuca (mild to slightly acrid).

Created: 2010-11-17 22:09:18 CET (+0100)
Last modified: 2014-02-06 15:47:51 CET (+0100)
Viewed: 147 times, last viewed: 2018-02-25 06:44:26 CET (+0100)
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