Colletotrichum boninense is characterized by its cylindrical and rather broad conidia with an obtuse apex and protruding base (Moriwaki et al., 2004).
Conidiogenous cells subcylindrical to obovoid, to fusoid, or irregular,
hyaline, smooth, generally tapering from the lower part toward a truncate apex with visible periclinal thickening, 10–25 3 3–5 mm. Colonies on SNA with sparse, white aerial mycelium; on PDA with moderate gray aerial mycelium and few aerial conidia (Lubbe et al, 2004)

The species is widely distributed worldwide. I suggest including it on the list of least concern (LC).

The species occurs worldwide, New Zealand, Mexico and Japan have more records of occurrence in GBIF.

According to GBIF, 174 occurrences are recorded in 15 countries, with the majority of those recorded in New Zealand, Mexico and Japan.

The species is associated with disease in plants.
Crinum leaves ssp. The Chinese, Passiflora edulis, Melo cucumber, cymbidii sp. Cliveland miniatae, Cattleya sp., Prunus mume the Atlantic Dendrobii.

The few strains recorded were collected in areas threatened by deforestation and urbanization.

The species is associated with disease in Proteaceae and Eucalyptus sp.

Unknown

https://www.gbif.org/species/2568785