Summary:
Insolibasidium deformans is not likely to be encountered casually. It develops in living leaves of Lonicera (honeysuckle), with hyphae intercellular and intracellular. It is a distinctive species producing an unusual conidial phase and basidia like those in the genus Herpobasidium.

Microscopic:
spores "5-7.5 x 9-13 microns, short cylindric and slightly curved or ovate-cylindric", smooth, inamyloid, colorless, thin-walled, apiculus oblique, "germinating by germ-tube or by repetition, often with a bifurcate tube"; basidia 20-40 x 4-6 microns, more or less cylindric, but curved to tortuous, 4-celled at maturity with transverse septa, sterigmata 10-15 x 2-4 microns, hypha-like to cornute, a thin-walled uninflated probasidial cell present that is empty and collapses when the basidium is fully extended; conidial stage (Glomopsis) "developing after, or instead of, the basidia, the conidiophores 30-60 x 5-9 microns, emergent through stomata, dichotomously branched or unbranched below, septate", the walls colorless, thin, typically giving rise to conidiogenous cells apically, each conidiogenous cell producing two spherical conidia 8-17 microns in diameter, colorless, thin-walled, "the wall verrucose, the verruculae branched and apically 2- to 5-lobed", in addition to the terminal ones, conidia later develop bilaterally from the subterminal cells, "these conidia are elongated, bent, bilobed, smooth at first but becoming verruculose, the verruculae more prominent than on the globose terminal conidia", conidia are smooth at first, all conidia appear to remain attached to the conidiogenous cells; "fertile hyphae giving rise to single terminal basidia which protrude through stomata, then proliferating to produce a cluster of basidia", "older parts of infected areas with scattered, closely adherent hyphae on leaf surface, affected areas having a thin, chalky, whitish bloom consisting mainly of protruding basidia or conidia", mainly on underside; hyphae 2-4 microns wide, thin-walled, colorless, clampless, those within cells irregularly lobed or branched, intercellular hyphae abundant, forming compact masses in substomatal chambers [under the stomata]

Notes:
Insolibasidium deformans is found at least in BC and IA.