Armillaria mellea
English: Honey mushroom, honey cap, oakroot fungus.
Content: Aromatic esters like armillaricin, armillarigin, armillasin; antibacterial and antifungal esters; organic acids like propionic, valeric, butyric, isobutyric.
Mycology
Wood-decaying fungus; parasitic to weakened shrubs and trees; proliferous growth and expansion; produces black shoestring-like strands; strangles trees or strengthens orchids.