Aspergillus clavatus - dark field photomicrograph
(from MycoAlbum CD bg GLB)
One of the more spectacular species, Aspergillus clavatus is recognized by the elongate, club-shaped vesicle at the apex of the tall, stout conidiophore. It is one of the largest of the Aspergillus species and conidiophores can be a few millimetres tall with the calvate head up to 0.3 mm ( 300 microns) and the support stalk is up to 60 microns wide. So this is a pretty impressive species. The conidial producing cells (phialides) line the outside of the club-shaped vesicle.