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Danny’s DNA Discoveries – Tectella and 'Panellus' mitis of the PNW (Incertae Cedis)
by Danny Miller

Click here for my Pictorial Key to white spored oysters.


Nobody has figured out what families these mushrooms are in yet, and I can't easily do it myself, since ITS, the gene region I am familiar with, is best for determining if two sequences are the same species or not and gets less and less useful for determining genus or family relationships. While some genes are better at this, no one gene gives strong support and 4 or 6 gene studies are usually required. Sometimes this means they will get their own families; sometimes it is discovered that they actual do fit into an existing family. If so, they'll be moved to those pages.

They are little, white spored oyster mushrooms (growing on wood with a lateral or absent stem).

Tectella - a unique little brown, stemless, veiled oyster mushroom. It sometimes appears near the Tricholomatineae or the Pleurotineae sub-orders, with no support.

'Panellus' mitis - a little white oyster with a small, stubby, downy lateral stem, unique for its peelable cap cuticle and gill edge. It was formerly lumped in with the rest of the non-veiled species. One possible genus name for it is to elevate its section from within Panus to genus, and call it Mitellus mitis n.p. I don't have any data on what families it is near.

abundant common uncommon rare - colour codes match my Pictorial Key and are my opinions and probably reflect my bias of living in W WA. Rare species may be locally common in certain places at certain times.

Click here to download the FASTA data of all my DNA sequences

Agaricales Incertae Cedis

Tectella cf patellaris EU - the unique veil on this all brown, little white spored oyster is only easily seen when very young and breaks off leaving only a roughness around the edge, but the species can still be recognized by the deep cup shape required so the veil can form as a flat surface. It is somewhat viscid when young and stemless and often attached to hardwood from somewhere in the middle of the cap!

We don't have EU sequences to compare to, but east and west coast sequences differ by 1 bp in ITS1 and 4 bp and 1 indel in ITS2, so it could go either way whether or not they are different species, which means its anybody's guess if we will have the real EU species here or if it will need a new name. We need EU collections.

probable Tectella patellaris © Jim Ginns


'Mitellus' cf mitis n.p. ('Panellus' mitis) EU - this little white capped (when fresh, then brownish), white spored oyster with a short, stubby, downy lateral stem, is unique for its peelable cap cuticle and gill edge. The gill edge is shown under the microscope to explain how it can peel off.

Our one local WA sequence (from hardwood, whereas the species is most often found on conifers) is 2 bp and 2 indels different than EU sequences. One of those indels is of length 16, but that could have happened in one event, so for now I'm assuming ours is the true species.

probable 'Panellus' mitis © Fred Rhoades,     'Panellus' mitis with gelatinized gill edge © Danny Miller


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