03212nas a2200217 4500008004100000245017200041210006900213300000900282490000800291520232300299653001702622653001302639653003202652653002402684653001302708653001302721100002202734700001802756700002102774856019902795 2024 eng d00aTwo new species of lichenicolous Arthonia (Arthoniaceae) from southeastern North America highlight the need for comparative studies of lichen parasites and their hosts0 aTwo new species of lichenicolous Arthonia Arthoniaceae from sout a1-210 v1273 a

Arthonia frostiicola and A. galligena are described as new to science based on collections from mountainous regions of southeastern North America. Arthonia frostiicola infects the saxicolous lichen Dirinaria frostii, producing emarginate black apothecia which erupt from within the host thallus. It is characterized by a dark hypothecium and 1-septate, obovoid ascospores which turn brownish and verruculose in age. It is known from five collections made in the southern Appalachian Mountains and Ozark Mountains in southeastern North America. Arthonia galligena produces galls in the thallus and apothecia of the corticolous lichens Lecanora masana and L. rugosella, and is apparently endemic to the high elevations of the southern Appalachian Mountains. It is characterized by a variably pigmented, pale to red-brown hypothecium and 2-septate, macrocephalic ascospores which turn brownish and verruculose in age. Keys to the species of Arthonia on Caliciales and Lecanoraceae are provided.

10abiodiversity10aendemism10ahost-parasite relationships10alichenicolous fungi10aNew taxa10ataxonomy1 aHollinger, J., P.1 aScott, P., A.1 aLendemer, J., C. uhttps://bioone.org/journals/the-bryologist/volume-127/issue-1/0007-2745-127.1.001/Two-new-species-of-lichenicolous-Arthonia-Arthoniaceae-from-southeastern-North/10.1639/0007-2745-127.1.001.short