Ganoderma resinaceum colonising Quercus rubra

After driving past this large red oak on multiple occasions, I thought I’d finally park up and have a more in-depth look at it. I’m glad I did, as there is a large (but very decayed) fungal sporophore at the base, within or around a buttress that ends up becoming a sort of girdling root (there are two large roots partially girdling the stem on this tree, as can be seen below). At first, I thought the fungus was a very old Pseudoinonotus dryadeus, though when I found an old remnant of the sporophore a few yards from the tree I noticed it had small segments of the characteristic lacquered appearance of Ganoderma resinaceum. Comparing the tube layer with existing photos I have from other samples, it also appears there are similarities in this regard, as are there similarities with the pore surface on the underside. For this reason, I’m running with Ganoderma resinaceum.

After sounding the tree with a nylon hammer, there was no indication of hollowing, and therefore one can suspect that the decay is well compartmentalised (or not at the stage where wood has become markedly degraded). As Ganoderma resinaceum can however infect principal roots in the location surrounding the stem base (according to literature), perhaps the girdling roots have lead to some localised decay just beneath the surface, from which this fungus has been feeding from. Of course, this is only a suspicion of mine, and I have no means of currently proving that.

ganoderma resinaceum quercus rubra 1
A lovely red oak (Quercus rubra) on a large roadside green.
ganoderma resinaceum quercus rubra 2
We can spot the roots girdling the stem and also the very sizeable sporophore of Ganoderma resinaceum.
ganoderma resinaceum quercus rubra 3
A closer look highlights its position relative to the buttress.
ganoderma resinaceum quercus rubra 4
We can see how the top part of the sporophore has come away, which I found some yards from the tree, and the tube laye remains.
ganoderma resinaceum quercus rubra 5
Here is another look at the tube layer, which does align with what one would typically expect from Ganoderma resinaceum (from my own experiences).
ganoderma resinaceum quercus rubra 6
And the ‘proof’ of it being Ganoderma resinaceum (for me), can be observed here, where one can spot the small remnants of a lacquered surface on the margin.
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Ganoderma resinaceum colonising Quercus rubra

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