He specialized in crust fungi of the basidiomycetes, collecting in Sweden (especially in Muddus National Park, the Gothenburg region and Värnamo), Finland and Canada.
[1] Eriksson was a student of John Axel Nannfeldt and Seth Lundell,[2] and defended his doctoral dissertation Studies in the Heterobasidiomycetes and Homobasidiomycetes-Aphyllophorales of Muddus National Park in Northern Sweden[3] on the wood-associated fungal flora in Muddus National Park at Uppsala University in 1958.
[1] Eriksson supervised several students who would later carry on the crust fungus tradition, including Nils Hallenberg and Karl-Henrik Larsson.
[1] Eriksson was the main author and illustrator of the book series The Corticiaceae of North Europe (1973–1988, Fungiflora publishing house).
Eriksson was known for his accurate and clear illustrations of micromorphological characters, a characteristic of this book series.