Observation 211126: Ganoderma sessile Murrill
When: 2015-07-22
Herbarium specimen reported

Notes: > A colony of overlapping shelves growing on top of mulch under a young ornamental tree (black plum).
> The fruiting bodies are firmly attached to whatever substrate is hiding under mulch (tree roots?).
> The surface is partly lacquered and soft in places
> As can be seen from pix, the pore surface bruises brown, and the spore print is rusty brown.
> The odor is fungal, pleasant and strong.
> The mycelium is white.
> Spores appear to be club-shaped and round in cross-section (the rolled perfectly between the slide and glass slip when disturbed by x1000 lens movement), double walled, with a large central “oil drop”, uniformly and densely covered by either small pits or shallow warts; the surface texture reminded me of the armadillo coat.

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No Problem
By: MSchink
2015-07-23 00:14:02 EDT (-0400)

Not all polypore spores are this interesting, Ganoderma spores are the first that I looked at under the microscope, and was quite dissapointed with how devoid of features most other mushrooms including polypores can be.

The double wall structure of the spore is one of the ways to distinguish Ganoderma and its closely related genera like Amauroderma and Haddowia from other similar polypores. The shape and “wartiness” of the spores can be a big help to distinguish species within the genus as well but is not always helpful due to a number of species sharing similar spore morphology. To go more in depth you can look at the pileipellis elements as well, though they take some careful preparation with a razor blade and dried specimen and likewise can only be so helpful due to species sharing traits.

Which is why gathering a lot of data like you did is excellent for Ganoderma. Yours is very typical of G.sessile even without the microscopy though, but the microscopy definitely helped confirm.

Thank you, MSchink
By: I. G. Safonov (IGSafonov)
2015-07-22 23:08:02 EDT (-0400)

I very rarely post polypores, but in this case I was asked to make an identification by my neighbor who is on the grounds committee in our community. That’s why I left such a detailed record on MO. :)
I’ve never seen polypore leave spore prints in their natural environment, so I came back and put a glass slide under that large cluster. This also happened to be the first time I looked at polypore spores under a scope. These were more exciting than the typical bolete and amanita spores I am used to.

Excellent
By: MSchink
2015-07-22 22:44:49 EDT (-0400)

Excellent observation with very good data. Note how the spores appear to be less warty than other Ganoderma species, this is indicative of members of the Ganoderma resinaceum clade. Of which G.sessile is one of our American members. If you cut or damage the white edge you should find that it bleeds a yellow liquid that will dry into a crystaline resin with some time. This bleeding can sometimes be inconsistent though, and they may not always bleed the first time you check. But I know of no other Ganoderma species aside from those sharing a close proximity to resinaceum that bleed.

The photo in my avatar is of one such specimen I grew.

Also…
By: Dave W (Dave W)
2015-07-22 21:46:35 EDT (-0400)

obs 184011 really looks a lot like this one.

Looks identical to…
By: I. G. Safonov (IGSafonov)
2015-07-22 19:26:59 EDT (-0400)

that of obs 104042. That one was positively IDed by Herbert Baker (Erlon), who, if I recall correctly, knows quite a bit about ganodermas. Thank you for suggesting the name, Walter.

Created: 2015-07-22 16:29:20 EDT (-0400)
Last modified: 2017-01-15 13:41:27 EST (-0500)
Viewed: 107 times, last viewed: 2017-01-15 13:41:10 EST (-0500)
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