Observation 55853: Ganoderma applanatum (Pers.) Pat.
When: 2010-10-18
No herbarium specimen

Notes: A very large shelf polypore on an upright dead tree. The shelf was 19" across and there were concentric ridges and color zones. The underside had pores and was partly covered with a whitish coating, probably a parasitic fungus. The magnified view of the underside was from an adjacent, much smaller but otherwise identical shelf on the same tree.

One observer suggested that Ganoderma applanatum is the correct ID. Certainly the size and the upper surface suggest this ID, but I have concerns about the pore surface. It is mostly white, but there are areas where the pores are brown, and the two tube layers are certainly brown (see photos 4 and 5). The pores look larger than usual in G. applanatum, and the white surface doesn’t mark when scratched. I suspect that the whiteness is from a parasitic fungus such as Hyomyces. What else, if anything, could this be?

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I agree with Ganoderma applanatum
By: Jason Hollinger (jason)
2010-10-22 17:32:23 PDT (-0700)

It’s odd that it’s not scratching. The reason it normally does is, as you can see in image 113699, the tubes are brown while the white is just a thin coating; scratch through the white coating exposes the dark tubes. But when a fruiting body dies and starts to decay, I’ve seen the white covering wear away slowly and look just like yours. I wonder if there is, as you say, a white mold growing on it, too, which is what’s causing it not to scratch? (I’ve seen the pores become larger during decay, too — they aren’t actually any less dense, of course, but the side-walls become thinner, making them look larger.)

Created: 2010-10-18 17:02:11 PDT (-0700)
Last modified: 2015-03-23 09:57:09 PDT (-0700)
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