Observation 158105: Postia caesia group

Code: Bot_781/2014_DSC9756

Habitat: Mixed forest, Picea abies and Fagus sylvatica dominant trees, steep mountain slope, southeast oriented; calcareous ground; sunny place but in half shade; partly protected from direct rain by tree canopies; average precipitations ~ 3.000 mm/year, average temperature 6-8 deg C, elevation 620 m (2.034 feet), alpine phytogeographical region.

Substratum: on cut-off surface of a small, dead trunk of Picea abies lying on ground partly still in bark, in late initial stage of disintegration.

Place: Lower Trenta valley, at the foot of southeast slopes of Mt. Pelc, 2.109 m (6.919 feet), between the second and the third switchback of the forest road to Berebica, East Julian Alps, Posočje, Slovenia EC

Comments: Growing solitary; pileus 7 × 3.5 × 2.5 cm, tube layer max 1.2 cm thick; flesh soft, fibrous, watery; bruising bluish-green-gray when handled; SP none observed; rather old sporocarp; spores taken from pore surface using soft, moist brush. Spores seem to be somewhat too small.

Nikon D700/Nikkor Micro 105mm/f2.8

Species Lists


Proposed Names

34% (2)
Recognized by sight: Distinctly blue Polypore.
Used references: (1) A.Bernicchia, Polyporaceaes.l., Fungi Europaei Vol.10., Edizioni Candusso (2005), p 332.
(2) S. Buczacki, Collins Fungi Guide, Collins (2012), p 490.
(3) M. Bon, Parey’s Buch der Pilze, Kosmos (2005), p 316.
(4) R. Phillips, Mushrooms, Macmillan (2006), p 313.
(5) G.J. Krieglsteiner (Hrsg.), Die Grosspilze Baden-Württembergs, Band 1, Ulmer (2000), p 548.
(6) L. Ryvarden, R.L. Gilbertson, European Polypores, part 2., Synopsis Fungorum 7., Fungiflora A/S (1994), p 435.
Based on microscopic features: Spores smooth, cylindrical and allantoid. Dimensions: 4.6 (SD = 0.3) x 1.5 (SD = 0.1) μ, Q = 3.14 (SD = 0.29), n = 30. Olympus CH20, NEA 100x/1.25, magnification 1.000 x, oil, in water. AmScope MA500 digital camera.
Based on chemical features: Smell indistinctive.
84% (1)
Recognized by sight: There are 24 species in the P. caesia complex worldwide of which 12 are documented from Europe
Used references: Miettinen et al. 2018

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