Horse chestnut (Aesculus hippocastanum) this tree had to be removed due to being colonised by Honey fungus.
Honey fungus is the common name given to several different species of fungi (Armillaria) that attack and kill the roots of many woody and perennial plants. The most characteristic symptom of honey fungus is white fungal growth between the bark and wood usually at ground level. Clumps of honey coloured toadstools sometimes appear briefly on infected stumps in the autumn.
Trees that have been colonised become vulnerable to windthrow and need to be dealt with quickly to eliminate the dangers and stop the spread of the pathogen.