https://www.wikiwand.com/en/Wood-decay_fungus

Thanks Himanshu. Can you tell that what is the species of the mold in the photo?

I think  it is Stachybotrys spp. Wood rich in cellulose is very favorable for this mold.

You better make slide and check it under microscope. It is hard to identify fungus just from the photo showing it grown on substrate so please provide the photo showing microscopic characters instead.

the color and colony characters look like Monilia, check again under microscope. but this is not Stachybotrys coz it should be black.

Interesting picture. Not Stachybotrys sp., as pointed out above. I assume that this is green (unseasoned) and the fungus is emerging from two of the nine pieces, probably because it was infected in the tree or shortly after felling. Without a closer look, not even sure it is a "mold", so I'd suggest microscopy. What is the wood species? I assume you are in Malaysia, why not ask someone at FRIM?

Hi all,

The photo is forwarded to me by my colleague. This mold always grow on copper quat pressure treated timber.

Thanks, Gan