[3] Its ecological role in the natural environment is less well understood, other than it is a common leaf endophyte of many temperate trees and shrubs[2] and in some cases may function as an entomopathogen.

[5] However, while it had not previously been recognized as a separate species, when grown on potato dextrose agar it produces a distinct pink to maroon red color on the bottom side and was described in historical studies as "chromogenic" isolates of Glomerella cingulata.

[1] C. fioriniae produces conidia that are smooth-walled, hyaline (glassy and translucent), with acute (pointed) ends, measuring about 15 x 4.5 microns.

[1] When grown on potato dextrose agar it usually produces a pink to dark red chromogenic color on the reverse side.

[10][11] Conidia are mostly produced at temperatures from 10 to 30 °C, such that in temperate deciduous forests and orchards rain-splash dispersal occurs from bud-break to leaf drop.