Observation 199371: Marasmius congregatus Mont.
When: 2015-01-06
No herbarium specimen

Proposed Names

-31% (2)
Recognized by sight
28% (1)
Recognized by sight
57% (1)
Eye3 Eyes3
Used references: Many thanks to Jadson Oliveira for the ID. See also Carla Puccinelli; Marina Capelari, Marasmius (Basidiomycota – Marasmiaceae) do Parque Estadual das Fontes do Ipiranga, São Paulo, SP, Brasil: seção Sicci, Hoehnea vol.36 no.4 http://www.scielo.br/...

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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Mop & bucket
By: Susanne Sourell (suse)
2015-02-23 08:13:00 PST (-0800)

Danny, I much appreciate your mop and bucket work, cleaning the taxonomic mess. Moreover you invite us all to consider from time to time the consequences of proposing names to lighthearted. And we really should.

On the other hand your frequent challenge of name proposals is very helpful. Any discussion can bring up new aspects, which we would not have questioned or read over or misinterpreted. Certainly I will continue to post on MO, with or without micro, with or without specimens. And where information is available online, I always try to include links for easy reference. These references do not mean that I am totally convinced unless I qualify them as “I’d call it that”.

It is great to have your input and constructive reviews. Thanks so much for mop & bucket and sharing your knowledge!

you have no doubt already
By: Danny Newman (myxomop)
2015-02-22 14:19:15 PST (-0800)

found in me a measure of apprehension in the application of species names in the absence of microscopy, except in the cases of the most iconic of macrofungi. I don’t think there’s any arguing, for example, with your righteous observations of Marasmius amazonicus. For others, there is an element of the blind leading the blind, which is a problem throughout the entire site. There are no hard-hitting Heterobasidiomycetologists (jelly people) active here, for example, yet we have plenty of names getting thrown around on observations of jelly fungi. so often these names are passed down from oversimplified field guides, the picture books of mycological literature, which may mention similar taxa somewhere in the notes/comments, but lack either the expertise or publishing budget to include in greater detail (think Xylaria hypoxylon and X. polymorpha).

There came to me a moment of just how much of a mess this may be when Europe-coprinologist graced us with his presence, and proceeded to bring order to a portion of of coprinoid chaos of the site. Being mostly a janitor these days myself (though more observations of my own are coming), and having just begun to go through the 186 pages of site activity I have missed since departing for Bolivia, it is part daunting, part upsetting, part frustrating to see what happens when no one takes a mop and bucket to the various kinds of taxonomic mess our mostly wonderful membership leave behind.

With that shameless, martyrish pat on the back out of the way, and returning to the matter at hand, I would predict Dr. Desjardin’s opinion on this observation to be a desire to see spores and hymenopelis, which are far too small for the current images to depict. That should never, however, deter you from continuing to post, with or without micro, with or without specimens.

Marasmius / Collybia
By: Susanne Sourell (suse)
2015-02-22 13:41:09 PST (-0800)

I agree, Collybia is out of fashion, but still it can be found with many descriptions of neotropical fungi. Mycobank for example still lists Collybia here. But, looking deeper into your suggestion of Marasmius I did find out that Dr. Desjardin uses the name Marasmius niveus in his publication ‘A redescription of Marasmius pellucidus, a species widespread in South Asia’. → http://www.researchgate.net/...

Some of the species I have encountered in the Cristalino region had some forked lamellae and others did not. While Dennis mentions sometimes irregularily forked lamellae, Dr. Desjardin describes them as not forked. I guess it can not serve as a characteristic.

Last but not least: Gregarious growth is mentioned by Dennis ( http://www.cybertruffle.org.uk/... ) and it is remarkable that the drawing of Dennis does shows brown colors in the stipe. I would not call that purplish brown →
Dennis, R.W.G. Some Agaricaceae of Trinidad and Venezuela. Leucosporae: Part 1. Plate 20
http://www.cybertruffle.org.uk/...

Surprising: Marasmius pellucidus from SE Asia looks very similar

a few problems
By: Danny Newman (myxomop)
2015-02-22 12:04:05 PST (-0800)

no irregular forking, no purple anywhere in the stipe, above or below, and no mention of highly grouped/caespitose growth habit. not only would micro be the thing to really confirm or deny a match with Dennis’ C. nivea, Collybia is not really in fashion anymore as a genus to house various white-spored tropical fungi. This is a Marasmius, through and through.

References
By: Susanne Sourell (suse)
2015-02-20 22:44:47 PST (-0800)

Compare: Dennis, R.W.G. 1951. Some Agaricaceae of Trinidad and Venezuela. Leucosporae: Part 1. Transactions of the British Mycological Society. 34(4):411-482
http://www.cybertruffle.org.uk/...
http://www.cybertruffle.org.uk/...
http://www.cybertruffle.org.uk/...

Created: 2015-02-20 11:33:54 PST (-0800)
Last modified: 2015-10-22 12:53:36 PDT (-0700)
Viewed: 96 times, last viewed: 2016-10-27 11:29:43 PDT (-0700)
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