''Penicillus'' is a

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial nomencla ...

of algae in the family

Udoteaceae Udoteaceae is a family of green algae, in the order Bryopsidales. Description Udoteaceae is a family of green algae that belongs to the order Bryopsidales. Udoteaceae are most abundant in reef ecosystems as it serves an important ecological ...

. ''Corallocephalus'' is a known synonym.

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Bryopsidales genera Udoteaceae {{green algae-stub