 Henning Eiler Petersen

Henning Eiler (Ejler) Petersen (22 August 1877 – 22 May 1946) was a Danish mycologist, botanist and marine biologist.He made a major contribution to unveiling the mysterious die-back of eel grass in Northern European waters in the early 20th century as a pathogen outbreak.Petersen's main research was in what was then known as "lower fungi" – Chytridiomycota and Oomycetes, but he also studied the systematics of Red algae.