Observation 4682: Russula aeruginea Fr.

When: 2007-10-27

Collection location: Redwood National Park, Orick, California, USA [Click for map]

Who: Douglas Smith (douglas)

No specimen available

Kinda went back and forth on this one, but now I am pretty sure. I measured the spore size and got ave size of 8.2 × 6.7 microns, using 5 spores. This puts it on the high side of the monograph, but that isn’t a big sampling of spore sizes, so I’ll take it. The gills are turning yellow from the spore color, and the taste was mild.

The first micro. shot here is at 1000x under oil immersion, and mounted in Meltzer’s reagent. This shows a few spores, with relatively small warts, and little to no lines between the warts. The spores are white, but the blue-black color is the amyloid reaction of the warts to the Meltzer’s (mostly iodine).

The second shot is at 400x, mounted in Meltzer’s, and this is of a gill edge. The clear longer cells are the cheilcystidia, and there are a few spots with spores still attached to the basidia. Notice the 2-spored basidia here.

The third micro shot is a section of the cuticle at 400x, mounted in KOH. The cap surface is seen here, and there are hyphal cells pointing upwards, with numerous pileocystidia as the thin hair like cells between.

This all matches the monograph discription of this species.

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