I saw few posts here with moldy firewood, people asking can it be burned? Most of my wood stays uncovered and every year some pieces, especialy oak gets really nasty like this.

S&S Fire Pits Blog

How to know if firewood is too old to burn well - Quora

70+ Uses for Wood Ash

How to know if firewood is too old to burn well - Quora

Shadow's Son by Shirley Meier, S.M. Stirling and Karen Wehrstein

Anyone else picky when they've got some punky wood on the outside

Is this really teak? It says it is.. 35$ on marketplace- can I do

S&S Fire Pits Blog

Is Something Hiding in Your Firewood? - - The Adirondack Almanack

Our Harman Fireplace Wood Stove goes BOOM! (updated Dec 5, 2023

Moldy Firewood on the bottom of the pile! - #408

Mold & Fungus On Your Firewood – Mapleseed Firewood