The Extinction map of Ark Survival Evolved has corrupted wood, which can be used just like fungal wood. The trees that yield corrupted wood are common, but you will have to travel outside the city to get it. Harvest corrupted wood from trees with grey-blue leaves (they grow most everywhere in the wasteland) and the red wood-like spires in the northern part of the wasteland. These sources of corrupted wood also yield thatch and crystallized sap. With corrupted wood, you will be able to craft the Abberation items that require fungal wood.
|Corrupted Wood (same as Fungal Wood) on Extinction.|