Observation 7233: Pholiota aurantioflava
When: 2007-12-29
Herbarium specimen reported

Notes: Ok, from the mycoblitz id party at Berkeley, these were given to me was possible Galerina. And at the time I thought they were, and first pass under the scope I thought they were. They have a viscid cap, nice orange-yellow-brown colors, this stipe darkening from the base, somewhat umbonate, macroscopically they look good to be a Galerina. But they are not…

The first micro-shot is of the cheilocystidia on the gill edge at 400x in Meltzer’s. The cystidia look a bit like Galerina cystidia, with half of them capitate. But half of them are not, they are straight and acute. And it is weird to be half and half. Also adding to this, the spores are non-dextrinoid.

The second micro-shot is of the cap cuticle, which is a thick ixocutis, of hyphae interwoven in a gelatin matrix. Very viscid guys. This is at 400x in Meltzer’s.

The third micro-shot of some spore from the stipe apex in KOH, at 1000×. The spores are ellipsoid, non-pointed and smooth. No exosporal covering.

The macroscopic all looks good for Galerina, except with a thicker stipe and viscid they should have a fiberous annulus, and they don’t, but there are a few that don’t listed in the monograph. The capitate cystidia looks good for Galerina, but the spores give it away. A Galerina that looks like this would have dextrinoid spores, pointed, and roughened. Since these are non-dextrinoid, ellipsoid and smooth, this is a Pholiota.

Looking in the Hessler and Smith monograph of Pholiota, on page 87, there is P. aurantioflava. Which in the comments they say looks to be a species that intergrades with Galerina.

After getting to Pholiota I notice that the gills are rather yellow-brown, and too yellow to really be Galerina, which should have tipped off Pholiota from the start, with the viscid cap and yellowish gills.

Ah live and learn…

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Created: 2008-04-04 01:42:02 CEST (+0200)
Last modified: 2008-04-04 01:57:58 CEST (+0200)
Viewed: 110 times, last viewed: 2016-10-28 22:44:37 CEST (+0200)