Observation 222911: Marasmiaceae Roze ex Kühner
When: 2015-11-14
Who: zaca
No herbarium specimen

Notes: Growing on wood.

Images

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Microscopy: Spores;
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Microscopy: Basidia;
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Microscopy: Gill-edge
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Microscopy: Cheilocystidia;
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Microscopy: Pileipellis (x100)
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Microscopy: Pileipellis-2;
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Microscopy: Pileipellis-3;
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Microscopy: Pileipellis-4 (Ramealis structures).

Proposed Names

22% (2)
Recognized by sight
58% (1)
Eye3 Eyes3
Based on microscopic features

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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My background
By: Danny Newman (myxomop)
2015-11-19 19:55:00 CST (-0500)

is rather spotty. As much time as I’ve spend with Dr. Desjardin, I have not inherited his skill for Marasmiaceae. Once I begin to progress through the microscopy and molecular analysis of my many Neotropical collections, I expect I will be more of a resource. Until then, I rely on mostly macromorphological features, and as such, can only provide IDs on the most macro-charismatic of species.

Hi Danny,
By: zaca
2015-11-19 15:51:01 CST (-0500)

Thank you for your candor, but I thought it could be easy for someone with your background to solve the problem or at least give clues to its solution. As specific literature I just dispose of vol. 3 of Flora Agaricina Neerlandica, where not been able to find anything like it. Thanks also for the list of experts who sent me, of whom only know the second, but by the importance of his work in another genre I’m interested in: Entoloma.

zaca
By: Danny Newman (myxomop)
2015-11-19 12:53:08 CST (-0500)

I am away from home, and therefore without books. Even with them, I would not likely be of much help here. I can tell you that you have so excellently documented this find that a real Marasmiologist would likely be able to give you a quick and accurate ID based on the information available.

I would try Vladimir Antonin (vantonin@mzm.cz), Machiel Noordelos (m.noordeloos@nhn.leidenuniv.nl), and/or Dennis Desjardin (ded@sfsu.edu).

Danny, can you give me an help on this one?
By: zaca
2015-11-18 19:08:08 CST (-0500)

I started by observing the pileipellis and soon I realize the existence of the so called ramealis structures at the end of the hyphae; then I thought this could be a Marasmiellus, but neither the spore shape nor the hymenium features applies. In fact, when looking to the gill edge I found some non expected cheilocystidia form, like the prolongment of the trama with roundish cells and of several other forms. For the spores I got the following dimensions:
(6.9) 7.6 – 8.9 (9.2) x (4.9) 5.4 – 6.2 (6.7) µm
Q = (1.3) 1.32 – 1.5 (1.6) ; N = 39
Me = 8.1 × 5.8 µm ; Qe = 1.4
What can it be then?

Microscopy added.
By: zaca
2015-11-18 19:05:39 CST (-0500)

Created: 2015-11-14 15:48:54 CST (-0500)
Last modified: 2015-11-18 19:05:06 CST (-0500)
Viewed: 49 times, last viewed: 2016-11-25 17:05:54 CST (-0500)
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