Observation 30086: Tricholoma myomyces (Pers.) J.E. Lange

When: 2009-12-11

Collection location: Bovec basin, East Julian Alps, Posočje, Slovenia [Click for map]

Who: amadej trnkoczy (amadej)

No specimen available

I am confused. Mushroom Observer as well as all Slovenian and German sources in my reach has Tricholoma terreum and Tricholoma myomyces as two distinct species. Index Fungorum and some other sources have T. myomyces as accepted name and T. terreum as its synonym? The mushrooms in this observation seem to have no veil as far as I can judge (see also http://www.mykoweb.com/CAF/species/Tricholoma_myomyces.html ).

Lat.: 46.35000 Long.: 13.56641
Code: Bot_404/2009-1280

Habitat: Open predominantly Pinus sp. forest, south oriented slope, warm place, calcareous ground, under a Pine, almost fully exposed to direct rain. average precipitations ~3.000 mm/year, average temperature 7-9 deg C, elevation 735 m (2.400 feet), alpine phytogeographical region.

Substratum: soil, humus

Place: South slopes of Mt. Rombon 2.208 m (7,244 feet), above ‘Pri Plajerjevi skali’ place, northeast of Bovec, Eat Julian Alps, Posočje, Slovenia EC

Spore print white to crème. These mushrooms grow in groups and lines.
Spore dimensions: 7,3 (SD=0.5) x 4.8 (SD=0.4) micr., n=20.

Nikon D700 / Nikkor Micro 105mm/f2.8


Motic B1-211A, magnification 1.000 x, oil, in water.

Proposed Names

24% (2)
Recognized by sight
Used references: – Personal communication Mr. Bojan Rot, http://www.gobenabovskem.si/index.php
- J.Grom, Naše gobe (in Slovene), Žepna Knjiga, (1981), p 68.
- G. Pace, Vse o gobah (in Slovene), Mladinska Knjiga (1997), p 143.
- M.Bon, Pareys Buch der Pilze, Kosmos (2005), p 154
- R.Lueder, Grundkurs Pilzbestimmung, Quelle & Mayer (2008), p 241.
- D.Arora, Mushrooms Demystified, Ten Speed Press, Berkeley (1986), pp 182.
Based on chemical features: Taste and smell mild, indistinctive.

Please login to propose your own names and vote on existing names.

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
By: Gerhard Koller (Gerhard)
2009-12-15 19:50:47 MST (-0700)

some mushrooms are not so picky. But this one is mycorrhized with pine tree species from the planes up to the mountains and from southern Europe up to Northern Europe. It is very wide spread, maybe even east to Asia. But on the other hand there are very picky mushrooms, e.g. Suillus plorans that only can be found in the high mountain region with Pinus cembra or Suillus sibiricus also up high with same tree in Asia and Europe and Suillus placidus introduced from America with Pinus strobus or Suillus lakei and its forms also introduced from over the pond with Pseudotsuga menziesii exclusively.

Thank you Gerhard for your in-depth explanation.
By: amadej trnkoczy (amadej)
2009-12-15 11:46:27 MST (-0700)

I had some specimens at home and I checked carefully their odor again – definitely not farinaceous, also even very old specimens didn’t have distinctly gray gills but still more or less whitish. Thus Tricholoma argyraceum/scalpturatum is (are) probably out of question.

Re: T. myomyces. There had been no young specimens there when I took photos. So, no wonder I overlooked veil. I was told Slovenian pros follow Index Fungorum. This is probably the reason that none of my Slovenian books and web sites lists T. myomyces – with one exception – http://www.gobe.si/Slike/TricholomaMyomyces . The picture published there is in a very good agreement with my photos with respect to the depth of grayness of pileus. So, there are no doubts in your determination. What I am puzzled now is how it can happen to find it (and there were many!) in Bovec basin? The Slovenian name for T. myomyces is ‘Kraška kolobarnica’ (Karst Tricholoma) somehow denoting it should be found in submediterranean phytogeographical region of Slovenia close to Adriatic Sea and not around Bovec which is an alpine phytogeographical region of Slovenia. May be mushrooms are not so ‘picky’ in this respect as higher plants? Have no experience.

Thanks again.

This seems to be
By: Gerhard Koller (Gerhard)
2009-12-13 16:22:28 MST (-0700)

a typical Tricholoma myomyces. You see the veil just in very young stages. But the overall colours of the mushrooms are way too bright for T.terreum if you decide to separate this two species. There are some doubts about that issue. But I am convinced there are differences. It just looks like Tricholoma argyraceum but lacks yellowing and the farinaceous odour and the gills just get grey when they are more advanced in growth. If you have observed any of those characters mentioned then look for T.argyraceum with silvery scales on the hat or Tricholoma scalpturatum with blackish scales. But then again there are doubts if those two species are distinct :)

Spores dimensions
By: amadej trnkoczy (amadej)
2009-12-13 08:33:07 MST (-0700)

A picture of spores and their dimensions added.

Created: 2009-12-11 14:50:20 MST (-0700)
Last modified: 2009-12-11 14:50:20 MST (-0700)
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