When: 2008-10-18

Collection location: Marconi beach, Wellfleet, Massachusetts, USA [Click for map]

Who: Noah Siegel (Noah)

No specimen available

A neat trich common on the cape, growing in the same areas as T. magnivelare under Pitch Pine (Pinus rigida) on Cape Cod and under Hemlock (Tsuga canadensis)
in north central MA.

Proposed Names

94% (3)
Recognized by sight

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= Observer’s choice
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Add Comment
T. sejunctum of Europe is described from broadleaved forests
By: Dimitar Bojantchev (dimitar)
2008-10-22 01:20:06 CDT (-0500)

T. sejunctum of Europe is described from broadleaved forests, while T. arvernense is from the P. sylvestris and Spruce habitats, so typical for Sweden, so I think that there’s a good reason behind that name usage. T. arvernense should have distinctly shaped marginal cells and distinctly smaller spores (just looking at the books) than T. sejunctum.

There is something that is not particularly accepted — T. sejunctum var. coniferarum (Bon), but it doesn’t even look like the regular var. sejunctum. Oh, T. sejunctum is being described from California as occurring with Sitka Spruce, but I doubt these findings.

T. arvernense and T. davisiae (Peck) seem close indeed, both have the yellowing tendency of the gills in age (per the original descriptions, never seen them myself :-)

Davisiae and “arvernense”
By: Irene Andersson (irenea)
2008-10-21 01:54:07 CDT (-0500)

are probably not exactly the same, but obviously very closely related species, according to the habitat, and behaviour of the colours from young to old ones. The shape of the cap is a bit different, but that’s all (from the macroscopic view).

It is just about the same thing with the matsutake species that they like to grow with, your magnivelare is only a bit paler than our nauseosum.

I’ll keep davisiae in mind if there will be more discussions about our “arvernense” in the future..

By: Noah Siegel (Noah)
2008-10-20 19:23:37 CDT (-0500)

Irene, I don’t know T. arvernense, but it looks closer to sejunctum then davisiae. Davisiae is like a greenish virgatum, a very umbonate upright mushroom. It is also highly variable in color, most start off dark green then go light green, yellow-green, yellowish-pink, pinkish, to almost white and everything in between. The umbo is darker; grayish-green most of the time. It also stains pinkish, especially the stipe base.
I have also seen it growing with Red Pine; it does occur on the west coast but I don’t know the tree associate.

By: walt sturgeon (Mycowalt)
2008-10-20 17:37:33 CDT (-0500)

I see this in Algonquin provincial park under red pine with Tricholoma magnivelare. Cape Cod seems a strange place for both although I have seen T. magnivelare there along with the “southern” Amanita polypyramis.

Interesting name
By: Irene Andersson (irenea)
2008-10-20 03:29:30 CDT (-0500)

This is a very interesting species to me!

Scandinavian mycologists have had a lot of trouble finding the right name on this one:

I kept the name sejunctum (which I beleive is wrong too) because I’m not quite satisfied with T. arvernense that they have decided to call this one.

T. davisiae and T. “arvernense” are obviously very closely related – or even the same..?