Adjective
arbutoid (not comparable)
Characteristic of the Arbutus genus; applied to a kind of mycorrhiza where the fungal hyphae form sheaths around the root tips.
Endomycorrhiza includes arbuscular, ericoid, and orchid mycorrhiza, while arbutoid mycorrhizas can be classified as ectoendomycorrhizas. Source: Internet
Indeed, symbiosis with root fungi is quite common among the order representatives, and three kinds of it can be found exclusively among Ericales (namely, ericoid, arbutoid and monotropoid mycorrhiza). Source: Internet