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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.