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Verrucaria tenebrosa (Verrucariaceae), a new lichen species from Finland and Norway, and notes on the taxonomy of epiphytic taxa belonging to the V. hydrophila complex

. Phytotaxa. 361, 2 (Jul. 2018), 211–221. DOI:https://doi.org/10.11646/phytotaxa.361.2.6.