Observation 85124: Polyporus brumalis (Pers.) Fr.
When: 2011-12-19
(46.34435° 13.56309° )
Herbarium specimen reported

Notes: Code: Bot_583/2011_IMG8267

Habitat: Light mostly broadleaf wood with scattered Picea abies, south oriented, relatively warm place, modestly steep mountain slope, cretaceous clastic rock (flysh) bedrock; humid, partly sunny, exposed to direct rain; average precipitations ~ 3.000 mm/year, average temperature 8-10 deg C, elevation 490 m (1.600 feet), alpine phytogeographical region.

Substratum: fallen deciduous tree trunk, rotten but still partly in bark; possibly Fagus sylvatica.

Place: Bovec basin, north of Mala vas, at the foot of Mt.Čukla, 1.756 m (5.761 feet), East Julian Alps, Posočje, Slovenia EC

Comment: Winter season and habitus of this observation speak in favor of Polyporus brumalis. However, spore dimensions and pore shape correspond better to Polyporus arcularious, which is a spring mushroom according to almost all references I found. Krieglsteiner (Ref.(3)) states that transition forms between both are frequent. According to Donk they are named Polyporus brumalis f. subarcularious, Donk, Medded. Nedl. Mycol. Ver. 18-20: 133 (1933). Index Fungorum considers this name as a synonym of P.brumalis. What is the latest word about somewhat ambiguous taxonomy of these two difficult to separate species is unknown to me. Interestingly the mushrooms where completely frozen when photographed, nevertheless after a day at room temperature they sporulated abundantly. Growing in a group of about 25 fruitbodies on a single about 4 m long log. Pileus diameter from 2.5 cm (one inch) to 6 cm (2.5 inch). Flesh tough, when dry very hard. SP abundant, light gray-whitish (oac893). Cap brown-gray (oac 639), pores surface beige (oac793), stipe brown (oac743) with some white mycelium at the base.

Nikon D700 / Nikkor Micro 105mm/f2.8 and Canon G11, 6.1-30mm/f2.8-4.

Proposed Names

74% (2)
Eye3 Eyes3
Recognized by sight
Used references: (1) A.Bernicchia, Polyporaceae s.l., Edizioni Candusso (2005), p 459.
(2) M.Bon, Parey’s Buch der Pilze, Kosmos (2005), p 314.
(3) G.J.Krieglsteiner (Hrsg.), Die Grosspilze Bade-Württembergs, Band 1, Ulmer (2000), p 602.
(4) R.Phillips, Mushrooms, Macmillan (2006), p 297.
(5) A.Bernicchia, Polyporaceae s.l., Edizioni Candusso (2005), p 457 (data of P.arcularius).
Based on microscopic features: Spore dimensions: 7.2 (SD = 0.4) x 2.6 (SD = 0.2) micr., Q = 2.77 (SD = 0.21), n = 30. Motic B2-211A, magnification 1.000 x, oil, in water. Kongo Red.
Based on chemical features: Smell indistinctive.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Created: 2011-12-25 11:29:35 PST (-0800)
Last modified: 2011-12-25 12:12:06 PST (-0800)
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