This method was in common use in the Tatum lab in the 1940's, but was apparently never published. One simply sucks the suspension through the cotton plug of a pipette, used upside-down. Graduated pipettes from 1 to 10 ml work well.
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"Filtering small quantities of conidial suspensions to remove mycelial fragments,"
Fungal Genetics Reports:
Vol. 37, Article 15.