Herman Phaff
... that during his career Herman Phaff collected 6400 strains of yeast creating a collection containing 400 of the 700 identified species of yeast?
... that during his career <b id="mwEF4"><a href="./Herman_Phaff" id="mwEF8" rel="mw:WikiLink" title="Herman Phaff">Herman Phaff</a></b> collected 6400 <a href="./Strain_(biology)" id="mwEGA" rel="mw:WikiLink" title="Strain (biology)">strains</a> of yeast creating a collection containing 400 of the 700 identified species of yeast?