You searched for: “thaniscophagy
Disintegration and absorption of arbusculae (dwarf trees; shrub-like trees) and sporangioles (spore cases) in mycorrhiza (symbiotic relationship between plant root cells and fungi).

Mycorrhiza refers to a mutually beneficial association of a fungus and the roots of a plant; such as, a conifer or an orchid, in which the plant's mineral absorption is enhanced and the fungus obtains nutrients.