Observation 168627: Physarum polycephalum Schwein.
When: 2014-06-28
No herbarium specimen

Proposed Names

8% (2)
Eye3 Eyes3
Recognized by sight: The host is Pleurotus ostreatus
-8% (2)
Recognized by sight: There are many slime molds with yellow or orange plasmodium. Without fruiting bodies we can’t be sure what they are.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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The truth.
By: Thomas Laxton (Tao)
2015-09-06 00:31:56 CDT (-0400)

There are many different Myxogastria with yellow plasmodium and of the 132+ species of Physarum, of which less than half of the plasmodial colors are known, there are 29 known to be yellow.
Many Myxogastria are opportunist and eat whatever is consumable and available around them. They are not host specific. To make an identification from plasmodium alone without fruiting material to examine is truly an assumption anyway.

I just took some photos this afternoon of what I believe is
By: Judi T. (AvidAmateur)
2015-06-16 21:29:06 CDT (-0400)

Physarum polycephalum. According to Lincoff (National Audubon Society Field Guide to North American Mushrooms, text p. 847, color plate # 561) the hosts are “dead wood and fleshy fungi.” He describes it as “most conspicuous in its beginning stage, as a yellow to greenish-yellow, branching network.” If you have this field guide, the color plate photo is an excellent representation of this early stage. I certainly expect to be seeing a lot more of this in my area (the St. Louis greater metropolitan area) since we have had nearly non-stop rain for weeks.

I could be wrong.
By: Thomas Laxton (Tao)
2015-01-10 12:46:22 CST (-0500)

But I have a sample of a Myxogastria growing on Trametes versicolor: http://mushroomobserver.org/141671?q=2TVOt This plasmodium is dark orange not yellow like Physarum polycephalum. I wouldn’t call it Physarum polycephalum with out seeing the fruiting bodies. I also have a Myxogastria on Phlebia tremellosa that has yellow plasmodium: http://mushroomobserver.org/161935?q=2TVOt I don’t think is Physarum polycephalum. But yes these seem to be consuming the fungi so you could be right.

By: walt sturgeon (Mycowalt)
2015-01-10 12:24:48 CST (-0500)

Are there many fungicolous Myxomycetes? And are they host specific?

Host was used to determine its identity
By: Patrick Harvey (pg_harvey)
2015-01-10 12:04:39 CST (-0500)

“Myxomycete collectors also tend to gravitate to habitats that will yield developing or mature fruiting bodies especially on ground sites such as decaying logs and leaf litter after rainy periods. Myxomycete species
assemblages are frequently associated with habitats characterized by specific terminology, for example, … fungicolous myxomycetes like Physarum polycephalum have plasmodia that feed on the oyster mushroom, Pleurotus
ostreatus; …”

‘Tales from past forays: Importance of habitats,’
article by Harold W. Keller, Botanical Research Institute of Texas, haroldkeller@hotmail.com
Appears in “Earthstar Examiner” March 2011, volume 102, page 6
— newsletter of the Missouri Mycological Society

Created: 2014-06-28 19:00:40 CDT (-0400)
Last modified: 2016-09-26 20:42:12 CDT (-0400)
Viewed: 120 times, last viewed: 2016-10-24 18:35:32 CDT (-0400)
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