Insolibasidium deformans is a species of fungus belonging to the order Platygloeales.

The fungus parasitizes leaves of various Lonicera species, causing honeysuckle leaf blight, a commercially significant disease in plant nurseries.

[2] The known hosts for Insolibasidium deformans include at least 18 species of Lonicera.

[3] The fungus parasitizes host leaves, producing hyphae within the leaf tissues and basidia that protrude through the stomata.

Microscopically, the basidia are auricularioid (tubular with lateral septa).