Observation 224000: Dermoloma josserandii Dennis & Orton var. josserandii

(MycoBank 430288)

Code: Bot_922/2015_DSC9586

Habitat: light mixed alpine forest, dominant trees Picea abies and Fagus sylvatica, about 30 m inside the forest bordering to an abandoned alpine pasture; ground vegetation mostly mosses, Oxalis acetosella, scattered Cyclamen purpurascens, Helleborus niger, Luzula sp., young Fagus sylvatica; cohabiting with Mycena epipterygia; flat terrain, calcareous ground; mostly in shade, humid place; protected from direct rain by tree canopies; average precipitations ~ 3.000 mm/year, average temperature 5-7 deg C, elevation 960 m (3.150 feet), alpine phytogeographical region.

Substratum: forest soil, under Picea abies, possibly mycorrhizal also with Fagus sylvatica.

Place: Zadnja Trenta valley, 60 m northwest of the final parking place of the access road, Zapodn place, East Julian Alps, Posočje, Slovenia EC

Comments: Two possible options have been proposed during discussions about this find – Melanoleuca exscissa and Dermoloma hygrophorus/Dermoloma josserandii. Both mushrooms are very similar. Measured spore dimensions fit to both. However, the pilei found seem smaller then of Melanoleuca exscissa, lack relatively short stipe compared to pilei diameter, have less crowded gills (L = 54) than Melanoleuca exscissa (L = 60 – 95, Ref.: 2) and spores doesn’t have verrucose spore surface. Therefore Dermoloma seems a better fit.

Names Dermoloma hygrophorus and Dermoloma josserandii are treated as synonyms by some authors (Ref.:4), while Index Fungorum and MycoBank threat both names as separate species. Dermoloma josserandii is known in two varieties Dermoloma josserandii var. josserandii with whitish-beige cap and Dermoloma josserandii var. phaeopodium with dark brown cap (Refs.: 2 and 4 and MycoBank). However, Index Fungorum treats Dermoloma josserandii var. josserandii only as a synonym of Dermoloma josserandii. Anyway, the find with its fruitbody dimensions, spore size, minutely granular cap, somewhat twisted, tapering downward and silky lined stem fits to our knowledge best to Dermoloma josserandii var. josserandii as described Ref.2.

Three fruit bodies found; from 1.8 to 4.2 cm in diameter, stipe 6 to 7 cm long and 3.5 to 8 mm in diameter; gills L = 54 (the largest pileus); SP very faint, possibly whitish, oac color could not be determined.

Nikon D700/Nikkor Micro 105mm/f2.8

Proposed Names

46% (2)
Eye3 Eyes3
Used references: (1) Personal communications with Mr. Anton Poler, Mr. Bojan Rot (www.gobenabovskem.com), Mr. Slavko Šerod (Forum http://www.gobe.si/forum/) and Mr. Branko Vrhovec, Horjul.
(2) S. Buczacki, Collins Fungi Guide, Collins (2012), p 178 and 210.
(3) J. Breitenbach, F. Kraenzlin, Eds., Fungi of Switzerland, Vol.3. Verlag Mykologia (1991), p 246.
(4) G.J. Krieglsteiner (Hrsg.), Die Grosspilze Baden-Württembergs, Band 3., Ulmer (2001), p 241 and 366.
Based on microscopic features: Spores dimensions: 5.9 [7.4; 8] 9.6 × 3.7 [4.6; 4.9] 5.8 microns; Q = 1.3 [1.6; 1.7] 1.9; N = 36; C = 95%; Me = 7.7 × 4.7 microns; Qe = 1.6. Olympus CH20, NEA 100x/1.25, magnification 1.000 x, oil, in water. AmScope MA500 digital camera.
Based on chemical features: Taste distinctive, unpleasant, rancid and slightly bitter; smell distinctive, pleasant.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Created: 2015-11-28 08:20:24 MST (-0700)
Last modified: 2015-11-28 16:15:04 MST (-0700)
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