Collection location: Zadnja Trenta Valley, East Julian Alps, Posočje, Slovenia [Click for map]
Habitat: bottom of an Alpine valley; steep slope at the edge of an old alluvial, grass covered terrace; edge of a large extensively used pasture; with scattered Picea abies, Betula pendula and Fagus sylvatica and different bushes; under Betula but also Picea trees not far; calcareous, sandy ground; mostly in shade; exposed to direct rain; average precipitations ~ 3.000 mm/year, average temperature 5-7 deg C, elevation 980 m (3.200 feet), alpine phytogeographical region.
Substratum: sandy soil.
Place: Zadnja Trenta valley, left bank of (dry) Soča river bed, south of the last pastures, East Julian Alps, Posočje, Slovenia EC
Comments: I considered two names for this find – Tricholoma scalpturatum and Tricholoma argyraceus Bull.. Breitenbach Ref.: 2 and Krieglsteiner Ref.:4 consider both as synonyms. Tricholoma monograph Ref.:6 doesn’t treat Tricholoma argyraceus as an independent species but (only briefly) as a subspecies of Tricholoma scalpturatum. Contrary Index Fungorum and MycoBank consider both names as valid names of two independent species. As far as I was able to study this find it fits reasonably well to the traits of Tricholoma scalpturatum. However, the facts that observed yellowing of the stipe and lamellae (typical for T. scalpturatum but not for T. argyraceus, Ref.:6) was quite modest (see picture #5, right most pileus), that the mushrooms were found under Betula pendula (Ref.:7 lists this tree as a known mycorrhizal partner only for T. argyraceus) and that the measured average Q of the spores is 1.6 (according to Ref.:7 it should be: 1.3 < Q < 1.5 for T. scalpturatum and 1.5 < Q < 1.9 for T. scalpturatum) speak in favor of alternative and less common Tricholoma argyraceus. Probably only an elaborate microscopy would give an answer to this dilemma.
Growing in scattered groups of several pilei, altogether more than thirty pilei; pilei diameter up to 4(5) cm; SP whitish, oac851.
Nikon D700/Nikkor Micro 105mm/f2.8
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