On display at the OMS Fall Mycocamp

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H. cf. umbilicatum in WNA
By: Joseph D. Cohen (Joe Cohen)
2018-11-06 09:25:23 WIB (+0700)

You’re correct that we don’t have H. umbilicatum Peck ss in the west.
So to avoid confusion, I’ll add Hydnum umbilicatum group as a Proposed Name for this Observation. That’s the MO Name corresponding to Hydnum cf. umbilicatum of Niskanen et. al. We do have this in WNA (and it’s a species complex).
For me Hydnum subsect. Tenuiformia is the best name for this Observation, unless there’s a way to distinguish photos of Hydnum oregonense from Hydnum umbilicatum group. Of course, YMMV and H. oregonense is a good possibliity

We don’t have H. umbilicatum in the west
By: Alan Rockefeller (Alan Rockefeller)
2018-11-06 08:46:44 WIB (+0700)

There are quite a few sequences of H. oregonense in GenBank and I have generated a few too. There isn’t any indication that this is a species complex in the west.

The only reason I would call this anything other than H. oregonense is if you think they could be immature specimens of H. neorepandum or H. olympicum.

subsect. Tenuiformia
By: Joseph D. Cohen (Joe Cohen)
2018-11-06 06:59:19 WIB (+0700)

I’m thinking it could be Hydnum umbilicatum group — unless there’s a good way to distinguish oregonense from umbilicatum in photos. (And my photos for this Observation are poor.) So, for now, I’m suggesting the narrowest classification that includes both oregonense and umbilicatum.

I can’t tell from the Mycologia article if absence of a distinct central depression is a good character. Page 2 of the on-line PDF hints that presence of a depression may be a good character:

[M]orphological characteristics suitable for species identification in Hydnum are few: mainly pileus color and robustness of the basidiomata, presence of a depression on the pileus, form and attachment of the spines, and size and shape of basidiospores. Morphological characters overlap between species, especially in the H. rufescens complex, making morphological recognition difficult or impossible.

Ron Pastorino did spore measurements of Observation 307575. The size is within range for oregonense, with some of his spores being too large for umbilicatum. So oregonense is a good choice for that Observation. But if that’s the right name for Observation 307575, then presence of a depression does not distinguish umbilicatum from oregonense — Ron’s pictures show a clear central depression.

Eastern collections
By: Alan Rockefeller (Alan Rockefeller)
2018-11-06 05:31:19 WIB (+0700)

I didn’t look at the photo, I just changed umbilicatum to oregonense. The eastern collections look different and have very different sequences.

Now that I look at the photo I can’t tell for sure what it is – are you thinking they could be immature examples of the repandum group? If this is the smaller species, I think we only have one west coast option.

oregonense v umbilicatum
By: Joseph D. Cohen (Joe Cohen)
2018-11-06 03:44:19 WIB (+0700)

Which photographically captured character(s) are you using to differentiate oregonense from umbilicatum (and umbiiicatum group).
Lack of central depression?