Observation 206045: Boletus sensu stricto nom. prov. Dentinger

Proposed Names

54% (1)
Recognized by sight: non-bruising white>yellow>green pores, white riticulation
Used references: North American Boletes
Based on chemical features: Ammonia sordid reddish on pileus, light pink on context, rusty red on stem

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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By: I. G. Safonov (IGSafonov)
2015-06-07 22:36:48 PDT (-0700)

is a name I created on MO specifically in mind for porcini-like boletes whose identification cannot be ascertained with enough confidence. This idea came to me after I read a paper by Dentinger et al.:

The genus Boletus that used to accommodate a ragtag collection of 300 bolete species is now reserved only for porcini & Co. that form a monophyletic clade. Old names still apply because bolete phylogeny is still very much a mess. We are now up to at least 60 genera, and there is no end in sight. Splitters seem to be very happy about it. :-)

Your bolete has an unusual tree host and macro-chemical tests. I hope you preserved a herbarium specimen. I think it’s a very interesting collection. Someone could eventually be interested in looking at its genes…

I would love
By: Leighton Bankes (paducahovoids)
2015-06-07 22:00:10 PDT (-0700)

Ideas of western species. The sign says America Mexico, it’s not clear but may refer to the distribution of the species. Both trees appeared to be fir imo (one had a sign) It was delicious. I made a cream of porcini soup. Best I ever had. Why is Boletus sensu stricto a nomen provencial? No one has ever published Boletus in the strict sense? Thank you for a response.I’ll scope it tomorrow and add the microscopy. I considered B. variipes for this, some of the chemical reactions seemed to be a better match, but in my search seemed to be restricted to hardwoods

By: I. G. Safonov (IGSafonov)
2015-06-07 19:39:40 PDT (-0700)

is a controversial moniker because it apparently belongs to a European porcini-like bolete (e.g., see Wikipedia). There exists further confusion as its description in North America is variable in different sources, such as Peck, Singer, Dick & Snell, etc., as well as morphological similarity to other Boleti sensu stricto, such as B. atkinsonii and B. variipes.

The old American name for B. reticulatus is B. aestivalis. I checked Ernst Both’s compendium for both names, and he discussed this mushroom under the latter name.

To quote Both: “Habitat: with oak and beech, not occurring with certainty in North America despite reports by earlier authors, for example Peck (1889). Singer (1977) collected it once at the Arnold Arboretum, MA, where it ‘may have been introduced with foreign plant material’.”

The fact that your mushroom was collected under white fir, a conifer that is native only to Western North America, suggests that it’s not B. reticulatus in any sense, though boletes can switch tree hosts. BTW, Kuo calles his bolete B. cf. reticulatus, which could well be a different species.

About B. reticulatus…
By: Dave W (Dave W)
2015-06-07 16:43:39 PDT (-0700)

Bessette says “under spruce at higher elevation.” I have collected B. edulis with cracked cap surface from under Norway Spruce… but late in the year when I think sub-freezing nighttime temps probably contributed to the cracking.

my concerns
By: Leighton Bankes (paducahovoids)
2015-06-07 15:36:59 PDT (-0700)

!. I found these under this fir tree and I found 2 others under what appeared to be spruce. The literature says mycorhizzal with hardwoods.
2. Bassette et. al. doesn’t list the chemical reactions, but Kuo’s page lists them differently than what I am seeing here.

Created: 2015-06-07 15:28:07 PDT (-0700)
Last modified: 2015-06-07 22:02:19 PDT (-0700)
Viewed: 123 times, last viewed: 2016-10-23 08:19:23 PDT (-0700)
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