Observation 223796: Boletus radicans Pers.
When: 2015-07-16
(46.4105° 13.7505° 1260m)

Notes: Code: Bot_902/2015_DSC7918

Habitat: mixed mountain wood, dominant trees Fagus sylvatica and Picea abies; moderately steep mountain slope, south aspect; calcareous ground; in shade; partly protected from direct rain by tree canopies; average precipitations ~ 3.000 mm/year, average temperature 3-5 deg C, elevation 1.260 m (4.150 feet), alpine phytogeographical region.

Substratum: forest soil.

Place: Trenta valley, near Vršič pass road, southwest slopes of Mt. Prisank, 2.547 , (8.357 feet), East Julian Alps, Posočje, Slovenia EC.

Comments: Texture and color of the upper surface of the hut, rooting stipe, turning blue on bruising and very strong bitter taste are typical traits of Boletus radicans. What surprises in this find is reddish coloration of damaged places (by snails) and quite distinctive reddish tones of the stipe. This is unusual with Boletus radicans and causes some doubts in our determination. However, no better alternatives have been found.

Growing solitary; pileus diameter 8.5 cm; quickly bruising blue-green when handled; SP faint, color indistinguishable.

Nikon D700/Nikkor Micro 105mm/f2.8

Proposed Names

57% (1)
Eye3 Eyes3
Recognized by sight: Brown cracked hut and very bitter taste.
Used references: (1) Personal communication with Mr. Bojan Rot and (conf.) Mr. Anton Poler.
(2) G. Kibby, British Boletes, Copyright Geoffrey Kibby (2011), p 20.
(3) R.M. Daehncke, 1200 Pilze in Farbfotos, AT Verlag (2009), p 72.
(4) M. Bon, Parey’s Buch der Pilze, Kosmos (2005), p 36.
(5) S. Buczacki, Collins Fungi Guide, Collins (2012), p 406.
Based on microscopic features: Spores smooth. Dimensions: 12.4 [13.7 ; 14.2] 15.5 × 5 [5.5 ; 5.8] 6.3 microns¸ Q = 2.2 [2.4 ; 2.5] 2.8; N = 34; C = 95%; Me = 14 × 5.6 microns; Qe = 2,5. Olympus CH20, NEA 100x/1.25, magnification 1.000 x, oil; in water. AmScope MA500 digital camera.
Based on chemical features: Taste strongly bitter, smell faint, unpleasant.

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Eye3 = Observer’s choice
Eyes3 = Current consensus

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Created: 2015-11-24 07:08:30 CST (-0500)
Last modified: 2015-11-24 07:08:57 CST (-0500)
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