Ingebrigt Severin Hagen

Ingebrigt Severin Hagen (1852- 8 June 1917) was a Norwegian physician and botanist who specialized in the taxonomy of the bryophytes.

He then continued research in Uppsala, Sweden with Professor Holmgren in 1877 and then at Berlin, Leipzig and Dresden.

He then moved to Oppdal Municipality, attracted by the mossflora, in June 1899 to work as a district clerk.

From 1906, the Nansen Foundation supported him in his bryological research and he worked on Forarbejder til en Norsk Lövmosflora from 1908 to 1915 dealing with twenty moss families.

In June 1910, he married Magdalene Dietrichs Borgen, daughter of a priest known for her work as an illustrator at the Trondheim museum.