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Scanning Electron Micrograph (SEM) of Penicillium showing the spores in basipetal succession (youngest spore at the base) forming chains from the flask-shaped  phialides (conidiogenous cells).

Spore production in Penicillium is so prolific, and the spores are so tiny, that   10,000,000,000 spores are produced on a single Petri plate culture

Don't believe me?  Count them!

Students:  How would I do that?   Details please!