Observation 46914: Leccinum Gray

When: 2010-06-10

Collection location: Sintra, Portugal [Click for map]

Who: zaca

No specimen available

Found in a pine forest, but having other tree of the genus Quercus. Bluish when cuted.


Proposed Names

19% (2)
Recognized by sight
57% (1)
Recognized by sight

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= Observer’s choice
= Current consensus


Add Comment
Thanks, myxomop.
By: zaca
2010-06-16 19:55:09 CDT (-0400)
By: Danny Newman (myxomop)
2010-06-16 12:00:42 CDT (-0400)

I see scabers but only in the sense that there are small, raised tufts of stipe material from the base to just beneath the apex. What strikes me as a bit different from the Leccinum I’m used to seeing in the US is that the scabers on this specimen are concolorous with the stipe rather than considerably darker. I know not whether this is a naturally occurring characteristic of certain Leccinum spp., a product of age, or an indication of another genus altogether.

I’m afraid I can’t tell you much about those reactions as my newfound microscopy skills have me only familiar with KOH and Melzer’s. If Roy gets a look at this, I’m sure he’ll have some very valuable insights.

Re: Your question makes all sense to me!
By: zaca
2010-06-15 13:54:53 CDT (-0400)

Let me explain: If MO was in Europe and I had to choose one genus for my specimen, I probably would have chosen Leccinum,
partly because of the existence of a granulation (I don’t remmeber the correct term in English!) in the stipe and also due to the hymenophore.
However, (a) From other Observations published here at MO, I have noticed that people in USA include what we call here Leccinum in the genus Boletus; (b) I could not find in my field guide a Leccinum sp. with the colors of the cap and of the bottom of the stipe similar to this specimen.
By the way, and because I forgot to mention when posting this observation, I made some chemical tests, whose results were as follows:
Lugol – positive reaction in the flesh; FeSO4 – Reaction grayish in flesh and in the cap; NaOH – yellowish reaction both in the flesh and in the cap,
but I was not able to interpret their meaning.

I upload two other photographs: one with a close-up of the stipe and another with a close-up of hymenophore.

Do you have closer shots of the stem?
By: Danny Newman (myxomop)
2010-06-15 12:20:00 CDT (-0400)

I’m wondering if this is a Leccinum as opposed to a true Bolete.