Håkon Holien

Biatora toensbergii is a species of corticolous (bark-dwelling), crustose lichen in the family Ramalinaceae. It is found in Norway and northwestern North America.

Xylographa soralifera is a species of bark-dwelling, crustose lichen in the family Xylographaceae. It was described in 2008 and belongs to the X. vitiligo complex, but differs from that species in both morphology and chemistry, including its production of fumarprotocetraric acid.

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Micarea leucopoda is a rare species of lichen in the family Ectolechiaceae. It is characterised by its distinctive granular body that appears dark greenish to greyish green and its unique stalked reproductive structures with black, spoon-shaped heads on whitish stalks. First described in 2002, this lichen grows primarily on the twigs of spruce and fir trees in humid coniferous forests across an amphi-Atlantic distribution, being found in coastal regions of central Norway and Newfoundland, Canada. The species typically occurs in older, undisturbed forests with high humidity, where it forms

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Lecidea coriacea is a species leprose lichen in the family Lecideaceae. Found in Europe and North America, where it grows on the bark and wood of various trees in old-growth and montane forests, it was scientifically described in 2016.

Arthonia toensbergii is a species of lichenicolous (lichen-dwelling) fungus in the family Arthoniaceae. It occurs in old-growth boreal rainforests in Norway, where it parasitises the lichen Mycoblastus affinis growing on trunks and branches of Norway spruce.

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