© Andrew Parker

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Danny’s DNA Discoveries – Crassisporium of the PNW
by Danny Miller


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

Some spring to summer burn "Pholiota" have long been known to be different because of their dry caps, reddish-brown spore print and thick spore walls, so they were placed in Pachylepyrium. Recent genetics showed that our species is quite different not only from Pholiota, but also from other Pachylepyrium, so a new genus (and eventually family) were erected for it and a couple other close relatives around the world - Crassisporium. And now we are discovering a second species.

Crassisporium funariophilum EU (='Pachylepyrium' carbonicola EU, ='Pholiota' subangularis ID) - True "Pholiotas" found in burn sites don't have a dry cap, don't have the reddish tint to the brown spore print nor thick walled spores, and are not usually restricted to the spring and summer. Formerly called Pachylepyrium carbonicola. ITS DNA of the newer Idaho species Pholiota subangularis is only a couple of bp different than the EU type sequence of Crassisporium funariophilum, and now that local species is considered to be the same.

Crassisporium PNW01 - we have 2 WA sequences and 1 AZ sequence of a unique species, differing by >10% in ITS. It seems to be inside this genus, but I haven't proven that. One of the three collections did not appear to be near any burned material, so I don't know if this species is obligate with burned wood or not.


Crassisporium funariophilum © Terri Clements and Donna Fulton,     C. PNW01 © Yi-Min Wang


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