Helgi Jónsson (11 April 1867, Rangárvallasýsla – 1925) was an Icelandic botanist 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
The diatom Navicula jonssonii Østrup is named after him.
Main works The marine algae of Iceland. Botanisk Tidsskrift 25: 378–380. 1902–1903. The marine algae of East Greenland. Meddelelser om Grønland 30: 1-73. 1904. The marine algal vegetation of Iceland. 1912 The Botany of Iceland
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