Abstract

Trimmatothelopsis ireneanaandT. wendyanaare described as new species based on collections from South Korea.Trimmatothelopsis ireneanais characterized by dark brown, punctiform apothecia having a raised dark brown apex, by the 0.1–0.3 mm wide, yellowish thallus areoles, and by a low (130–175 μm) hymenium.Trimmatothelopsis wendyanais characterized by reddish punctiform apothecia, by the smooth, yellowish brown, thallus areoles with round to irregular shape, overlapping as if a squamulose thallus, and by a high hymenium (220–250 μm). A phylogenetic analysis demonstrated the two species to be closely related and separated from otherTrimmatothelopsisspecies as new clades in the mtSSU analysis. In the ITS analysis, the clade of the two new species was found to be a sister toT. rhizobola.A key is presented to all 13 accepted species ofTrimmatothelopsis.

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