[1] The species is a fungal plant pathogen that has been recorded from the Central African Republic, the Ivory Coast, and Senegal.

David suggests that it is probably cercosporoid (referring to a form genus of imperfect fungi that are leaf parasites with long slender multiseptate spores) and is more likely to be appropriately classified in Passalora or Phaeoramularia,[3] although no formal transfer to either of those genera have been made.

[2] These cankers become covered with a dense reddish-brown to blackish-brown mat formed by the septate conidiophores of H. luci.

The conidia, usually triseptate (i.e., they contain 3 internal partitions, or septa), are cylindrical to rounded, light yellow-brown, foveolate (with small, pit-like depressions or indentations) and measure 19–30 by 4.5–6.5 μm.

[6] Heterosporium luci has been recorded from the Central African Republic, the Ivory Coast, and Senegal.