Observation 21758: Marasmius pulcherripes Peck
When: 2009-04-21
No herbarium specimen

Notes: Not 100% sure, but it seems very likely.

Proposed Names

46% (2)
Recognized by sight: more closely resembles these: http://www.mushroomexpert.com/... M. haematocephalus is… bloodier, not so pink. Could very well constitute a distinctly Australian species, given the apparent Eastern North American distribution of M. pulcherripes, but I’d rule M. haematocephalus out for now.

Please login to propose your own names and vote on existing names.

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
I stick to photos
By: Steve Axford (steveaxford)
2011-02-28 17:48:15 PST (-0800)

I guess I’ll leave it to you guys as I’m certainly no expert. I can see the argument for DNA testing as it is the definitive test and even microscopic examination can get it wrong – and has done in the past. Of course, DNA testing just isn’t possible for most of us, so we have to rely on observation. All I do is take photos and send off the occasional specimen that someone gets interested in.

By: Danny Newman (myxomop)
2011-02-28 17:32:06 PST (-0800)

is just the kind of question I’d have asked you, Roy, had you not asked it first. Though why invoke the eastern US when this is an Australian observation?

There are a few pages worth of Marasmius key material in Fungus Flora of Venezuela to go through, but it relies heavily on micromorphology.

By: Roy Halling (royh)
2011-02-25 04:02:22 PST (-0800)

Does E USA vs the neotropics weigh in at all in distinguishing these species? What about microscopy? Without vouchers, and examining them, it is really tough at this point. Nice pic!

Microscopy, maybe. DNA, later.
By: Danny Newman (myxomop)
2011-02-24 19:42:59 PST (-0800)

I think we could rule out (or in) a number of possibilities if there was simply more literature to look at. I’m sure it’s out there. If it was possible to describe no less than 10 variations of M. haematocephalus without DNA analysis in the late 1950s, it’s possible to determine today (without DNA analysis) whether or not this is one of them.

DNA testing
By: Steve Axford (steveaxford)
2011-02-24 15:55:50 PST (-0800)

I think the only way to be really sure is by DNA testing – and that is extremely unlikely. I haven’t even been able to get the blue Leratiomyces properly tested, so this one isn’t going to happen. Oh well.

follow up
By: Danny Newman (myxomop)
2011-02-24 11:11:49 PST (-0800)

in addition to the comments listed with the above name proposal:

Without some more in-depth data on the group, there’s really no way to tell what differences among red-capped, leaf-decomposing, Marasmius spp. constitute variations of M. haematocephalus or different species altogether. Having a thorough description of just M. haematocephalus, much less any of its many variations, would be a good place to start. That said, I can at least attest to what I’ve seen called M. haematocephalus by a handful of good authorities on this specific taxon, and the ways in which those examples differ from this one.

1. M. pulcherripes is described as being umbonate when young. No examples of M. haematocephalus I’ve seen exhibit this feature.

2. The cap margin of M. pulcherripes fades to a lighter pink while the center remains dark. M. haematocephalus should be vinaceous and uniformly so from center to margin.

Their similarities outweigh their differences. What little material I’ve been able to come across on each reports a fondness for the same substrates and overlapping distribution. Both possess sparse, widely-spaced, white or slightly pink-tinged gills with deep pleats/striations. Stem coloration and the presence or absence of basal mycelium appear to be variable. Instinctually leaning toward M. pulcherripes, but am prepared to be proven wrong if/when more data can be produced.

Created: 2009-06-06 02:50:54 PDT (-0700)
Last modified: 2011-02-24 19:43:26 PST (-0800)
Viewed: 359 times, last viewed: 2016-10-26 17:04:18 PDT (-0700)
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