Dear Oadi,

I'm not sure, but maybe it is genus Heterobasidion (or Fomes). What kind of tree? The fungus grows close to the root? This type of fungi cause a white rot.

kind regards A.

The tree is Maple

Heterobasidion annosum sometimes grows on deciduous trees.

Thanks Aleksandra: Can this kind of fungus kill the trees?

Yes, fungus can lead to dying off tree.

I am not sure about genera, I think it is not Heterobasidion, but I am not sure. In any cases, this fungus causes rot of tree, but, if conks has developed on the tree, it means, tree has infected several years ago.

Biruta

Dear Oadi,

The fungus is Trametes ( Coriolus) vericolor. This is wood rotting fungus. Usually grows on dead  trees.  In Kakinada, Andhra Pradesh, India, it is growing on a dead mango tree. 

This is very useful in the treatment of cancer.  Lot of work has been done.

With best wishes and regards,

Thammayya

Dear Oadi,

This is Ganoderma applanatum, a conk growing on deciduous tree species, known as artists` fungus for its pore surface bruising brown and retains as that. The species is saprotrophic. You can see http://www.mushroomexpert.com/ganoderma_applanatum.html for further details.

Best regards,

Elena

The images uploaded by Oadi Manty are seems to be of Fomes sp. and by Anisetti Thammayya are Ganoderma lucidum. Both cause wood decay. 

Ganoderma applanatum - very popular in Poland on alive and died trees (esp. Acer, Fraxinus...)

best regards,

Marek

Ganoderma applanatum 

Hi Oadi, 

Shelf fungi are very cool!

It looks like a Ganoderma species, probably applanatum species (complex?) because of its nonlaccate basidiocarp. I say that it is Ganoderma because it is a common shelf from hardwoods like maple and it looks like the pore layer (white underside surface) oxidized a brownish color, which is typical of the 'artist conk'  ( I think there are oxidized fingerprints on the pore surface in one photo).  This oxidation and color change does not happen with Heterobasidion, so it is an easy way to tell them apart (but difficult for people only looking at the photos of white pore surface to tell from Heterobasidion). If  you can easily draw on the fresh pore surface and it turns reddish brown, then you know it is a Ganoderma species.  Ganoderma species cause stem decays, root and butt rots of many hardwoods and also of some conifers. The type of decay is a white rot in which lignin, or lignin and cellulose is degraded. Usually by the time you see a fruiting body there is alread extensive decay inside the tree. For example, in trembling aspen most of the trees in a study I think it was like 85% that had wind throw also had Ganoderma conks present.  The living tree may or may not show any obvious outward symptoms, but with conks present, if your tree is alive it is more vulnerable to windthrow. Along a quite lakes edge it may be just fine to leave it and useful to wildlife, nesting birds etc., regarding people -don't camp underneath it, climb it. If it were on a busy street or in a campground where windthrow could be an issue, in my opinion, probably best to remove it. This fungus is also a saprobe of dead tree tissue. 

Best, 

Laura

Ganoderma applanatum, a parasite/saprofite on hardwoods.

I am not sure that it is Ganoderma applanatum.

I don't see the tipical surface: "with a dull, unvarnished outer crust; often furrowed in "zones"; brownish to grayish brown".

It is certainly a Ganoderma of this Group but more near Ganoderma adspersum.

With regard to the damage to the host plant  I confirm what is expressed by Laura Sims.

Ganoderma spp.

It seems some species of Ganoderma.