Johan Havaas

Norwegian botanist (1864-1956).

Johan Johnsen Havaas (Havås) (19 October 1864–27 April 1956) was a farmer and botanist from Granvin Municipality (at that time it was called Ulvik Municipality) in Søndre Bergenhus county, Norway.

Abbreviations: Hav.
Occupations: bryologist, botanist
Citizenships: Norway
Dates: 1864-01-01T00:00:00Z – 1956-01-01T00:00:00Z
Birth place: Granvin Municipality
Direct attributions: 0 plants, 6 fungi
Authorship mentions: 0 plants, 9 fungi

6 fungi attributed, 3 fungi contributed to9 fungi:

Hypogymnia tubulosa (Powder-headed Tube Lichen) (Schaer.) Hav. 1918
fungi species in the parmeliaceae family
Hypogymnia tubulosa is a species of foliose lichen in the family Parmeliaceae. Ludwig Emanuel Schaerer formally described it in 1840 as a variety of Parmelia ceratophylla. Johan Johnsen Havaas promoted it to distinct species status in 1918. The lichenicolous fungus Tremella tubulosae, described as a new species in 2020, has been recorded in Scotland and Spain. It causes the formation of distinct, convex, dark brown to blackish galls on the surface of the host thallus.
Scoliciosporum ophiosporum (Hellb.) Hav. 1909
fungi species in the scoliciosporaceae family
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Stereocaulon subdenudatum Hav. 1954
fungi species in the stereocaulaceae family
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Buellia crystallifera (Vain.) Hav. 1913
fungi species in the caliciaceae family
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Polyblastia subathallina Hav. 1954
fungi species in the verrucariaceae family
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Arthopyrenia cupreoferruginea Hav.
fungi species in the trypetheliaceae family
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Usnea fragilescens (Fragile Beard Lichen) Hav. ex Lynge 1921
fungi species in the parmeliaceae family
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Usnea fragilescens f. fragilescens Hav. ex Lynge 1921
fungi form in the parmeliaceae family
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Stereocaulon saxatile f. paschaleoides (Hav.) I.M. Lamb 1969
fungi form in the stereocaulaceae family
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