Observation 212359: Boletaceae Chevall.
When: 2015-08-09
Collection location: Casco, Maine, USA [Click for map]

Notes: Growing in sandy soil near Quercus sect. Lobatae. Quercus sect. Quercus and Pinus strobus further away. 2 fruiting bodies joined at the base. I first found them as primordia on August 2nd, and collected the mature fruiting bodies on August 9th when I discovered that someone had kicked them over. Stems not reticulate or pruinose, pinkish red at base and pale yellow above, bruising dark blue. Pores orange with a yellow zone near the edge of the cap; bruising dark blue. Cap surface dry, bruising dark blue. Cap context whitish; bruising slowly and not very strongly dark blue. Some hyphae in the cuticle reddish in Melzer’s reagent.

Images

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August 8th
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August 8th
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August 9th
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August 9th
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August 9th
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August 9th
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August 9th
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August 4th
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August 2nd
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Cuticular hyphae in Melzer’s reagent

Proposed Names

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Comments

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Oaks
By: walt sturgeon (Mycowalt)
2016-12-29 00:25:50 PST (-0800)

are the primary hosts for “B. subvelutipes” in NE Ohio and W. Pa.

In Ohio and Indiana…
By: Django Grootmyers (heelsplitter)
2016-12-28 22:36:48 PST (-0800)

most of the “subvelutipes group” boletes I’ve found were growing with oak or possibly other hardwoods in the Fagales. I have found some similar boletes growing in conifer-dominated forests in Maine and New Hampshire, with at least one collection from New Hampshire from an area where I didn’t notice any oak. There was birch nearby though. I don’t know how host-specific these taxa are though.

Peck didn’t mention the ecology of Boletus subvelutipes in the original description other than “woods … New York” although he did mention that species in his concept of sect. Luridi were more common in frondose woods. He didn’t designate a holotype, but I checked on Mycoportal and there are 2 collections identified as B. subvelutipes by Peck available at the New York State Museum listed as “probable syntype[s]”.

It would be great if someone did a type study on this group that involved microscopic reexamination of types as well as a multilocus phylogenetic anaylsis of specimens that are recent enough to sequence. There are hundreds of specimens identified as B. subvelutipes on Mycoportal, not to mention all of the other similar taxa. There’s definitely sufficient material for someone with the time, access to collections and funding to do this.

It’s good to know that the context could become whitish in age. Reviewing the description of B. subvelutipes in “North American Boletes”, I see that the authors arrived at a similar conclusion about that species. I agree with Dave that the smooth stem doesn’t really fit for B. subvelutipes. Peck mentions the stem being “somewhat pruinose”.

Dave: Boletus bicolor var. borealis is a Lanmaoa species, so there are at least some red-pored Lanmaoa species. The tubes on this seem too deep for this to be a Lanmaoa though.

Igor: NAB-18 also is Boletus roseolateritius now. I’m pretty excited to see the new book.

Subvelutipes
By: I. G. Safonov (IGSafonov)
2016-12-27 14:40:38 PST (-0800)

Over the years I’ve seen many example of red-pored “subvelutipes series” growing locally in pure frondose woods under oaks. On a few occasions I also “experienced” the hemlock-loving taxon/taxa Dave’s been collecting in his neck of the woods. I agree this observation doesn’t exactly fit the “subvelutipes species complex” concept, so it’s likely the representative of a satellite group. None of these red-pored types have yet been placed into any genus within the Boletaceae. They escaped the studies of Nuhn et al. (2013) and Wu et al. (2014), but they surely belong in the poorly resolved “Pulveroboletus Group”, as defined by the latter reference. There is a dearth of sequences in GB and it’s not clear (with exception of FJ480442) what morphological types hide behind whatever few sequences are available.

I saw this observation…
By: Dave W (Dave W)
2016-12-27 12:23:52 PST (-0800)

and my very first impression was “Lanmaoa”. But the reddish pore surface immediately put me off of that train of thought.

Subvelutipes? The stipes seem too smooth (as opposed to punctate/pruinose). Also, the weak bluing reaction for the cap context does not match my concept of (local NE PA) subvelutipes.

This observation appears to represent an oak associate. I can’t recall the last time I found something seemingly qualifying as subvelutipes under oak (possibly never). However, John P and Scott P say they find subvelutipes in oak-dominated settings. Maybe check some of their observations?

Yes, Django,
By: I. G. Safonov (IGSafonov)
2016-12-27 11:39:08 PST (-0800)

Dave’s obs 207985 and possibly obs 209319 (=obs 251141), though the latter one looks different from yours when mature.
I don’t know if NAB-13 has a published name, but maybe the answer to that is in the new book which is now available. Also, as you probably know, NAB-16 & NAB-17 = Boletus roodyi, and NAB-19 = Boletus billieae (known only from Cape Cod).
As far as the color of the flesh and bluing are concerned in older & desiccated specimens in the “subvelutipes group”, IME the flesh is usually white (as opposed to yellow when young and fresh) and the bluing action is slow and not as vivid.

Maybe
By: Django Grootmyers (heelsplitter)
2016-12-27 09:37:36 PST (-0800)

The whitish color of the cap context and its slow blue bruising are fairly distinctive IMO. I didn’t find a very good match in North American Boletes and the closest thing I found in the Mushroomexpert key was Boletus roseobadius. It’s tempting to think it’s that but it also wasn’t a very good fit. It does look a little bit like NAB-13. Do you know if there’s a published name for that now? Also, was it Dave’s obs 207985? I wish I’d have gotten better pictures and field notes for these.

Part of the “subvelutipes group”?
By: I. G. Safonov (IGSafonov)
2016-12-27 08:15:56 PST (-0800)

I think Dave W might have collected a similar-looking species in the past. Maybe not… Also these remotely look like NAB-13 (collected in WV) in Bessettes’ old book, but I don’t think the two are the same.

Created: 2015-08-10 07:38:18 PDT (-0700)
Last modified: 2016-12-27 01:09:59 PST (-0800)
Viewed: 134 times, last viewed: 2017-02-19 10:18:08 PST (-0800)
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