If a clinical laboratory identifies an Aspergillus isolate using conventional criteria, without molecular or extrolite data, then the term ‘complex’ is best added after the species name to accommodate for the lack of exclusion of cryptic species, as in “A. niger complex”. If further identification procedures are conducted to determine the species then that full name should be used as in A. niger or A. awamori. This might include Maldi-TOF or other proteomic identification, once the specifity of the technique for that group of species has been full assessed.

If a species variant, such as “Aspergillus awamori var. ferrugineus” is not excluded, the species name can be used, if there is confidence that it is that species based on molecular and/or extrolite data.  

The term ‘section’ is best used in publications and by taxonomists when describing a group of closely related species, which have been fully identified at species level.

Reference: What is a species in Aspergillus? (Samson & Varga)