Under hemlock, birch, tulip.
Pileus: 8-12 cm in diameter, wide & convex, smooth, rose pinkish with whitish to yellow olive spots.

Pores: Yellow at first, becoming dingy olive-yellow, staining blue and then bluish-brown.

Stipe: Nearly equal or tapering down to the base; yellow base color with some red to pinkish tinges, sometimes with reddish-yellowish striations.

Context: White to pale yellow, staining bluish in the cap context and sometimes in the stipe, as well.

Odor and taste: Not distinctive
Mycelium color: Yellow

Species Lists


Copyright © 2018 I. G. Safonov (IGSafonov)

Proposed Names

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DNA results discussion
By: I. G. Safonov (IGSafonov)
2018-12-02 21:31:01 PST (-0800)

A clean, contiguous and super-long TEF-1-alpha sequence was obtained from this collection by Dr. Kudzma. There are no ambiguous sites; it’s a single haplotype. The typically sequenced region between and including the EF1-983F and EF1-1567R primers is 604 bps long, which is the shortest I’ve seen in boletes so far (it’s typically 607-613 bps long). It is preceded by 273 bases and is followed by 556 bases, for a grand total of 1433 bps!
A BLASTn search of the 611 fragment indicates that miniato-olivaceus possibly belongs in Xerocomoideae (see the uploaded phylogram). The top hits at ~95% are two recent accessions of “Xerocomus” sclerotiorum. Morphologically, this makes at least some sense. That species is closely related to Pulchroboletus rubricitrinus. While I am not suggesting “mini-o” is also a member of Pulchroboletus, it could clade near it, perhaps as a sister gen. nov. Also, interestingly enough Baorangia and Lanmaoa entered the picture here. This is not the first time, however, I see this “behavior”, suggesting a knock on the Xerocomoideae door. In Wu et al. 2014/2016, the phylogenetic positions of both Baorangia and Lanmaoa within the Boletaceae, particularly the former one, have remained unresolved.

Created: 2018-06-18 07:21:50 PDT (-0700)
Last modified: 2019-07-03 20:10:57 PDT (-0700)
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