Gustaf Lagerheim

Nils Gustaf Lagerheim (1860–1926) was a Swedish botanist, mycologist, phycologist, and pteridologist.

Today, he is best remembered as one of the chief architects of pollen analysis as a tool in botany, alongside his student Ernst Post.

In 1895, botanists Giovanni Battista De Toni and Robert Hippolyte Chodat published Lagerheimia, which is a genus of green algae in the family Oocystaceae, named in his honour. Then in 1940, Boedijn published Lagerheimiella, another green algae genus.