Armillaria species
Common Names are Honey Fungus, Boot Lace Fungus.
Photograph: Fungus growing on dead Birch, New Forest, England. These fruiting bodies were visible at heights of 15 feet!
This fungus has the ability to produce structures called Rhizomorphs which resemble woody roots or boot laces. These structures can spread through the soil to infect other trees and stumps etc.They also spread under the bark of infected trees. The photograph below shows the Honey Fungus Rhizomorphs under the bark of a felled Oak tree.
The next photograph shows a close up of the Rhizomorph structure. They have a woody consistency and can be easily confused with twigs or thin roots.
Photograph below by Paul Casey showing the strands under the bark of an Acer negundo.
Please Note: Many Fungi are toxic and individual reactions to them vary widely. Do not touch or eat fungi unless you have accurately identified them. The AIE can not accept any legal responsibility or liability for errors in identification or for individual reactions to the consumption of fungi.