Ganoderma resinaceum Boud.
Lacquered Bracket, DE: Harziger Lackporling
Slo.: smolena pološčenka

Code: Bot_908/2015_DSC8633

Habitat: Alpine pasture; moderately incline mountain slope; southeast aspect; calcareous, stony, colluvial ground; shallow soil layer; full sun, dry and relatively warm place; exposed to direct rain; average precipitations ~ 3.000 mm/year, average temperature 7-9 deg C, elevation 625 m (2.050 feet), alpine phytogeographical region.

Substratum: at the base of dead stump of a stand alone, cut down, mostly decorticated Ostrya carpinifolia.

Place: Lower Trenta valley, between villages Soča and Trenta, right bank of river Soča, ‘Na melu’ place, near Trenta 2b cottage, East Julian Alps, Posočje, Slovenia EC.

Comments: According to keys of genus Ganoderma published in Ryvarden (2014) and Bernicchia (2005) this find fits well to Ganoderma resinaceum. It has distinctly stipitate pileus, continuous, partly shiny and reddish-brown (not dark brown and dull as with Ganoderma applanatum and Ganoderma australe) resinous crust, which first melts and then burns with a yellow flame when heated at the tip of a knife in the flame of a match and a darker line in context just above tube layer. However, some traits not mentioned in the keys pose problems. The context color doesn’t seem to correspond well to the descriptions in Ryvarden (2014) and Krieglsteiner (2000) (‘pale grayish-brown’) and Bernicchia (2005) (‘brown, red-brown’). The find was found on dead stump of Ostrya carpinifolia (host species not listed as a possible substrate in the literature available to me) while Ganoderma resinaceum is known from live deciduous trees. Measured spores are slightly too long and too wide in average compared to most published data (the only exception is Ref.: 4). Their width fits better to similar Ganoderma pfeifferi, which is apparently always sessile and never stipitate. Measured spore dimensions actually fit perfectly to Ganoderma carnosum, which is, however, know only from conifers. Also the habitat of the find seems strange. Ganoderma resinaceum is usually found in parks, roadsides, seldom in woods. All this makes my determination uncertain to some extent.

Growing solitary; pileus dimensions 10 × 8 cm; oozing reddish droplets when cut, pore layer bruising brown when handled; trama fibrous-corky and very firm, difficult to cut even with a ceramic knife; taste bitter, smell distinctive, pleasant, a kind of mushroomy; SP faint, possibly brown.

Nikon D700/Nikkor Micro 105mm/f2.8

Species Lists


Resinous crust.
Oozing red droplets when cut.

Proposed Names

82% (3)
Used references: (1) L. Ryvarden, I. Melo, Poroid fungi of Europe, Synopsis Fungorum 31., Fungiflora A/S (2014), p 191.
(2) A. Bernicchia, Polyporaceaes l., Fungi Europaei, Vol. 10., Edizioni Candusso (2005), p 238.
(3) G.J. Krieglsteiner (Hrsg.), Die Grosspilze Baden-Württembergs, Band 1., Ulmer (2000), p 427.
(4) J. Breitenbach, F. Kraenzlin, Eds., Fungi of Switzerland, Vol.2. Verlag Mykologia (1986), p 332.
(5) S. Buczacki, Collins Fungi Guide, Collins (2012), p 486.
Based on microscopic features: Spores brown, rough, thick (double) walled. Dimensions: 11.4 [12.2 ; 12.6] 13.5 × 6.9 [7.5 ; 7.8] 8.5 microns; Q = 1.4 [1.6 ; 1.7] 1.8; N = 30; C = 95%; Me = 12.4 × 7.7 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 bitter, smell distinctive, pleasant, a kind of mushroomy.

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Add Comment
Thanks a lot for your extensive explanation and confirmation of the determination.
By: amadej trnkoczy (amadej)
2015-12-19 04:15:13 CST (-0600)
Excellent observation.
By: Matthew Schink (MSchink)
2015-12-17 18:40:45 CST (-0600)

This is a very good compilation of data, I agree with Ganoderma resinaceum. One thing to note about the discrepancies in spore sizes among various literature is that in many cases the authors presume a worldwide distribution and look at specimens from all over, but G.resinaceum is a European name. It should be distinguishable from G.pfeifferi by having finer echinulations on the spores. I do believe pfeifferi has a rough spore type with larger speckles while G.resinaceum has a smooth type, with smaller and finer speckles.

The context color may be slightly variable, this could be due to any number of factors. There also appears to be great genetic divergence in G.resinaceum from various parts of Europe, so it may be a species complex. However your spores confirm that this at least is in the G.resinaceum clade. The oozing of the resin when cut is also a key. Substrate is highly variable among most Ganoderma species and is not strict. I have samples of G.sessile (North American G.resinaceum) from both conifers and hardwoods, identity confirmed through ITS DNA.

Do note that G.resinaceum is usually sessile, but occasionally grows on a stipe. Often leading to confusion with G.lucidum. But again your spores offer clear evidence for this not being G.lucidum. To get a better idea of what I mean when I talk about the spores being either smooth or rough check out Stipes and spores in two british Ganoderma species, by Martyn Ainsworth. I think it is freely available, it is only a short article but you should find it useful.

Created: 2015-12-17 04:29:13 CST (-0600)
Last modified: 2015-12-19 19:45:52 CST (-0600)
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