Observation 18621: Russula Pers.

Odor mild, taste mild.
Cystidia clindrico-clavate. 30 μm long.
Cheilocystidia mucronate. 20 μm long.
Basidia large, long sterigmata. Base 48 μm long, sterigmata 19-20 μm long.
Pileocystidia dark purplish-vinaceous in sulphovanillin (not grey or blue-gray, so perhaps this doesn’t count as a positive reaction). 61-73 μm long.
Spores 8.5 × 6.7 μm. Small spines, nearly complete reticulum.
Under Quercus agrifolia.


Copyright © 2009 Christian F. Schwarz
Copyright © 2009 Christian F. Schwarz
Copyright © 2009 Christian F. Schwarz
Pileocystidia in sulphovanillin.
Copyright © 2009 Christian F. Schwarz

Proposed Names

85% (1)
Recognized by sight

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Add Comment
By: Christian (Christian Schwarz)
2009-02-21 02:28:15 CST (-0500)

Mostly, I have my equipment to thank. In turn, I have my professor and the University to thank.

The only other methodology I use that might make a difference is that I often make sections vertically from a SINGLE gill laying face-side down – not from a “wedge” of cap and gill tissue as some suggest. Also, I make sections using a very powerful dissecting scope (also from Nikon), and use the thinnest available cover glass.

By: Alan Rockefeller (Alan Rockefeller)
2009-02-20 23:29:17 CST (-0500)

I have a picture of the nice Nikon scope he uses here. This picture also includes a pic of the key to the lab but I reduced the resolution enough that the key can not be duplicated from the image. I am also curious how this image was made, the gill face looks so clean and visible, almost like it was made with something more like a stereo zoom microscope. Sometimes I can see cool stuff like this when I look at a gill face but usually it looks more like a blurry mass of cells.

Spectacular micro-photo (36923)
By: Dimitar Bojantchev (dimitar)
2009-02-20 22:25:44 CST (-0500)

Very high resolution and very clean photo 36923. Please share the
equipment and technique.

With this high resolution you can give us some more

Amongst other things, the spores really look like something in the
emetica Section — silvicola/cremoricolor, in our area…

Slide and Russula Gallery
By: Christian (Christian Schwarz)
2009-02-19 00:38:58 CST (-0500)

I’m not sure exactly what you are asking, but it is a lamellar fragment mounted in Melzer’s.

As for Mike Davis, I heard him speak at the FFSC meeting – I find that the “Russula Gallery” is a great first step, but currently of limited utility. The main usability problem is the poor choice of page-by-page formatting. Even working around this, there is a problem with inconsistent reporting of characteristics. Some entries say SV-, some say SV+, and some do not report SV reaction at all, etc…

Spore background?
By: Darvin DeShazer (darv)
2009-02-18 21:54:25 CST (-0500)

What kind of a slide is the photo of the spores taken on? What is the background?
Russula photos from CA:
Davis Lab-DNA verified