Observation 26351: Boletus rubrosanguineus (Walty) ex Cheype
When: 2009-09-26
Herbarium specimen reported

Notes: Lat.: 46.38381 Long.: 13.78532
Code: Bot_384/2009-4484

Habitat: Open mixed wood with lot of ground vegetation, predominantly Picea abies, in shade, calcareous ground, protected from direct rain by tree canopies, average precipitations ~3.000 mm/year, average temperature 6-8 deg C, elevation 820 m (2.700 feet), alpine phytogeographical region.

Substratum: soil

Place: Zadnjica valley, lower Stružnik place, East Julian Alps, Posočje, Slovenia EC

Comment: Bruising blue, blue-green, but slowly and not very deep (bruising not shown on pictures).

Ref.:
G. Pace, Vse o gobah (in Slovene), Mladinska Knjiga (1997), p261
J.Grom, Naše gobe (in Slovene), Žepna Knjiga, (1981), p33

Nikon D70 / Nikkor Micro 105mm/f2.8

Proposed Names

25% (5)
Eye3
Recognized by sight
Used references: G. Pace, Vse o gobah (in Slovene), Mladinska Knjiga (1997), p261
J.Grom, Naše gobe (in Slovene), Žepna Knjiga, (1981), p33
54% (4)
Recognized by sight: intensely red pores, pinkish hue on cap

Please login to propose your own names and vote on existing names.

Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

Add Comment
‘spruce and beech’
By: amadej trnkoczy (amadej)
2013-02-02 00:20:48 PST (-0800)

Thank you Gerhard again for your comment. As already admitted I am not knowledgeable enough to participate constructively in this discussion. But the forest at this observation was exactly what one would characterized by ‘spruce and beech’, with probably somewhat acid ground (some Vaccinium myrtillus present).

Main hosts of Boletus rubrosanguineus
By: Gerhard Koller (Gerhard)
2013-02-01 15:28:16 PST (-0800)

are spruce and beech.

Upon looking old pics up found this one again
By: Gerhard Koller (Gerhard)
2009-10-08 13:40:23 PDT (-0700)

and now I have to say this is neither B. satanas nor B. rhodoxanthus but B. rubrosanguineus, formerly called B. satanas ssp. moseri. It’s the brother of thermophilous oak growing B. rhodoxanthus.

additional info
By: amadej trnkoczy (amadej)
2009-10-08 05:48:38 PDT (-0700)

Dear Kate,

Here are the answers to your questions in both messages.

The specimens are 9-11 cm tall having pileus 9-10 cm in diameter. I found only these two. Generally the dominant trees around are Picea abies and Fagus sylvatica. Unfortunately, I was not careful enough about possible exceptions. But I will certainly be there again this year and if I find a different tree I will inform you.

The Slovenian references state that B. satanas is “… not common …” in Slovenia. Note that Slovenia, although very small, has very diverse phytogeographical regions from submediterranean to alpine. So, what does this actually mean for northwest Slovenia which is an alpine phytogeographical region and where I live I don’t know.

My personal experience is very limited because until recently I thought that all boletus with red or reddish pileus underside are “vražji goban”, translated Satans’ bolete. Only recently I’ve paid more attention to them and found out (may be 10 – 12 funds altogether this year) that most of boletus of this kind are B. luridus (will post one in short)and possibly some B. rhodoxánthus, B. satanas being relatively uncommon.

The slight hint of blue bruising on the area of the cap in the 5th image is actually how the bruising looks like. The final intensity of the bruising is reached in one or two minutes. Interestingly, I’ve kept both specimens in refrigerator for a few days and they lost completely the bluish tint.

Thanks to you and to I.G.Safonov for your compliments :-)

Warmest regards
Amadej

Is there a hint of blue bruising on image 5 Towards the edge of the cut?
By: kate (kate)
2009-10-07 15:53:18 PDT (-0700)

There appears to be a slight hint of blue bruising on the area of the cap were you exposed the pores in the 5th image, is that the case? Is that the color of the blue you mentioned it bruised? I agree with the other comment excellent documentation! Kate

Excellent Observation
By: I. G. Safonov (IGSafonov)
2009-10-07 11:43:46 PDT (-0700)

Well done, Amadej!!! In my opinion, this impressively detailed write up (including the magnificent pictures, of course) should be the paragon for all future posts…

Created: 2009-10-07 11:12:28 PDT (-0700)
Last modified: 2013-02-02 00:45:18 PST (-0800)
Viewed: 371 times, last viewed: 2016-11-19 13:53:31 PST (-0800)
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