Who: Sava Krstic (sava)
[PNW Key Council Foray]
In grass, just by the road through the camp, dirty from road cleaning that same morning. Iodine odor developed soon after picking (a few hours).
I am wondering if this collection can be identified macroscopically: is it M. filopes or M. metata? Even with all the micro done, I’m not sure yet, still learning the two species, hope one day I will know.
Had there been pinkish tinges, that would say metata, but the absence says just that filopes is more likely. Then cystidia, is the majority sessile (filopes_) or stipitate (_metata)? The cystidia were extremely hard to extricate here and my sample may be insufficient for conclusion about majority, but they do look mostly stipitate (some of the pedicels are broken in my process of refining the mount). That’s one argument. Another, hopefully stronger, is the absence of clavate caulocystidia, and I did look carefully. Finally, the spore length/width ratio is always 2 or more (up to 2.5) in what I saw, which is in the reported range for metata but not for filopes (where it should be less than 2).
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Lorelei, thanks a lot for your comment. Brian commented in an email too, affirming the real difficulty in distinguishing between the two species. He also mentioned the ‘cuff’ that helps identify filopes. I’m aware of that character (photo in http://mushroomobserver.org/262580?q=4rnx, for example), but am not seeing it here. I wonder also if we have enough evidence to eliminate the thought of metata when we see it present. As for pinkish tinges in filopes_, I’ve seen it only on the gills, several times, for example in the same ‘cuffed’ collection above: http://mushroomobserver.org/image/showimage/692192?obs=262580&q=4rnx. The color seems to be more pronounced, though (sadly) not necessarily present, in metata—as a “pink shade at the centre of the cap” (Aronsen & Laessoe). I have one collection of distinctly pink Filipedes (from NW Portland!) and you can see it here: http://mushroomobserver.org/image/show_image/692192?obs=262580&q=4rnx. I called it metata, but my confidence is low.
Hi Sava — Seemingly one of the distinguishing characters for filopes is its tendency to form a ‘cuff’ in younger specimens where the pileus cuticle extends beyond the lamellae, which your younger specimens appear to have. In one key, I note that either metata or filopes can develop pinkish tinges when drying, so that would not be diagnosic. Will be interesting to hear what Brian has to contribute. I would vote for filopes at this point (based only on the literature).
The usual hugs, Lorelei
Created: 2017-04-30 23:34:20 EDT (-0400)
Last modified: 2017-04-30 23:37:10 EDT (-0400)
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