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Observation 342735: Tricholoma grave Peck

Notes:
Two collections of what appears to be the same species made at the NJMA foray by unknown participants. Might it be some kind of Tricholoma?
Very large, meaty and heavy mushrooms with a pronounced and unpleasant spermatic odor. The gills of the younger fb were already orangish. The large fb weighed in at estimated 1 lb; whoever lugged it around at the 2 hr foray had lots of patience & stamina. :-) The concave cap of the large fb was 7-8" measured directly across the top. The color in the pix are accurate.
The material has been preserved and sampled for DNA by J. & N. Burghardt.
MycoFlora/NAMP collection #09609.

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Images

Natural scattered light, no flash
Natural scattered light, no flash
Natural scattered light, no flash
Natural scattered light, no flash
Natural scattered light, no flash
Natural scattered light, no flash
Natural scattered light, no flash
Copyright © 2018 J. N. Burghardt
Gill crush mount

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Comments

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Material is preserved…
By: I. G. Safonov (IGSafonov)
2018-11-06 17:21:49 CST (-0500)

…and has been sampled for DNA sequencing (presumably ITS only) as part of a NJMA MycoFlora project, NAMP collection № 09609.

Hardwood mycorrhizae in autumn
By: I. G. Safonov (IGSafonov)
2018-11-05 10:54:24 CST (-0500)

Yes, I know, some fungi can fruit in mid- to late fall when it seems deciduous trees have long shut down for the season. I have a basswood tree here that “produces” a fruiting of A. phalloides only in the fall (November) every year. My Death Cap is fruiting now. Pure hardwood (oak) stands are a rarity in the Pine Barrens, so sometimes symbiotic associations are not so obvious. I wouldn’t be surprised if T. grave can grow with pines, too. To my knowledge most, if not all, identifiable trich taxa in the NJ Pine Barrens grow with pitch pines…
Yes, I was hoping this gets sequenced, too. I just found out NJMA is doing a MycoFlora project. So maybe if not now, then next time.

Definitely try to get this preserved though
By: Django Grootmyers (heelsplitter)
2018-11-05 02:07:37 CST (-0500)

First state record IMO and it’s a rare species. Would be really cool to have this sequenced. I wouldn’t be too surprised if this turned out to be something other than a Tricholoma.

Not too late for oaks
By: Django Grootmyers (heelsplitter)
2018-11-05 02:05:35 CST (-0500)

I find a lot of Tricholoma, Cortinarius and Hygrophorus species mycorrhizal with oaks well after the leaves have fallen in late November here in Ohio. Oak-mycorrhizal crusts like Byssocorticium atrovirens and potentially oak-mycorrhizal Tulasnella species will also fruit during winter thaws here.

Sure, it could be adapted…
By: I. G. Safonov (IGSafonov)
2018-11-05 00:26:34 CST (-0500)

…to grow in different habitats with variable soil pH. Kinda late for oaks as the mycorrhizal partner for November, but I guess still possible… I’ve just written to the Burghardts to have this collection saved.

The habitat’s not too far off
By: Django Grootmyers (heelsplitter)
2018-11-05 00:18:23 CST (-0500)

Kind of a limited sample size for sure to say that it’s limited to that. If the host is oak then that fits well for this. Looks very close morphologically.

Thanks, Django
By: I. G. Safonov (IGSafonov)
2018-11-05 00:14:58 CST (-0500)

Looks like a good fit based on the online pix. One thing that doesn’t fit though is the habitat reported for modern collections in http://iucn.ekoo.se/iucn/species_view/231720/. This collection is from the Pine Barrens (sandy acidic soil and pine-oak woods), but if could fit the habitat reported by Peck in his original description (see Bessettes’ Tricholomas of North America, p.g 177).

Looks like Macrocybe titans
By: Logan Wiedenfeld (LoganW)
2018-11-05 00:08:50 CST (-0500)

The cap is off or that species, but the scaly stipe and the size fit. Surely that species hasn’t made it to New Jersey yet!