Helgi Jónsson (11 April 1867,

Rangárvallasýsla Iceland was historically divided into 23 counties known as ''sýslur'' (), and 23 independent towns known as ''kaupstaðir'' (). Iceland is now split up between 24 sýslumenn (magistrates) that are the highest authority over the local police ( ...

– 1925) was an Icelandic

botanist Botany, also called , plant biology or phytology, is the science of plant life and a branch of biology. A botanist, plant scientist or phytologist is a scientist who specialises in this field. The term "botany" comes from the Ancient Greek wo ...

and phycologist. He specialized in the research of marine algae and subarctic vegetation. During his career, he undertook many botanical trips throughout Iceland.Islandica, Volumes 5-8
Google Books

Main works

* ''The marine algae of Iceland''.

Botanisk Tidsskrift ''Botanisk Tidsskrift'' (standard abbreviation ''Bot. Tidsskr.'') was a Danish mixed scientific and amateur journal concerning botany, issued in Copenhagen by the Danish Botanical Society. It was published from 1866 to 1980, when it fused with Bot ...

25: 378–380. 1902–1903. * ''The marine algae of East Greenland''.

Meddelelser om Grønland ''Meddelelser om Grønland'' ("''Communications on Greenland''") is a Danish scientific periodical which publishes scientific results from all fields of research on Greenland. It was established by Frederik Johnstrup and published as a single seri ...

30: 1-73. 1904. *
The marine algal vegetation of Iceland
'.

The Botany of Iceland ''The Botany of Iceland'' is a five-volume classic scientific work on flora and vegetation of Iceland. It includes fungi, lichen, algae, bryophytes, and vascular plants. History It was published 1912 to 1949 and funded by the Carlsberg Foundation. ...

, edited by L. Kolderup Rosenvinge & E. Warming, J. Frimodt, Copenhagen, and John Wheldon and Co., London; Vol. 1, Part 1, pp. 1–186. 1912. The

diatom A diatom (Neo-Latin ''diatoma''), "a cutting through, a severance", from el, διάτομος, diátomos, "cut in half, divided equally" from el, διατέμνω, diatémno, "to cut in twain". is any member of a large group comprising sev ...

''Navicula jonssonii''

Østrup Østrup is a surname. Notable people with the surname include: * Ernst Østrup (1845–1917), Danish botanist and phycologist, mainly working on diatoms * Johannes Østrup (1867–1938), Danish philologist and professor * Lauritz Christian Østrup ...

is named for him.

References

Helgi Jonsson 1867 births 1925 deaths Phycologists {{Iceland-scientist-stub