In addition, there are a number of edible imperfect fungi, including the ones that provide the distinctive characteristics of Roquefort and Camembert cheese.

For example, the ubiquitous and industrially important mold, Aspergillus niger, has no known sexual cycle.

[citation needed] However, because phylogenetic methods require sufficient quantities of biological materials (spores or fresh specimens) that are from pure (i.e., uncontaminated) fungal cultures, for many asexual species their exact relationship with other fungal species has yet to be determined.

Under the current system of fungal nomenclature, teleomorph names cannot be applied to fungi that lack sexual structures.

Classifying and naming asexually reproducing fungi is the subject of ongoing debate in the mycological community.