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Well-developed thalli of Erioderma mollissimum have been found on the island of Newfoundland. Previously reported collections from other areas of Atlantic Canada, and from high elevations in the southern Appalachians, were small and poorly developed. It had been suggested that these might represent a distinct, undescribed species. However, the morphology and chemistry of the collections reported here confirm the identity of the Newfoundland population as E. mollissimum.

Some additions and corrections to the recent treatment of this family in North America are made. The new species, Fuscopannaria convexa P. M. Jorg,. is described from hypermaritime Alaska. From this region, the hairy subantarctic Psoroma hispidulum Nyl., is recorded as new to North America. Fuscopannaria laceratula (Hue) P. M. Jorg. and Psoroma tenue Henssen are shown to have a wider distribution than previously anticipated, the latter arctic-alpine. Fuscopannaria labrata, a sorediate species, is described as new from maritime cliffs on the Channel Islands, California. The subtropical species Pannaria malmei C. W. Dodge, was incorrectly recorded from North America, and the material is renamed Pannaria rubiginella P. M. Jorg. & Sipm., a species recently described from Juan Fernandez in Chile. The new combination, Santessoniella crossophylla (Tuck.) P. M. Jorg., is made. A key to the two terricolous, Arctic species of Fuscopannaria containing green algae, F. globigera Fryday & P. M. Jorg. and F. viridescens P. M. Jorg. & Zhurbenko, is given.

Two remarkable, new species from the Arctic are added to the terricolous Fuscopannaria praetermissa complex: F. abscondita P. M. Jorg., with apothecia hidden among the claviform squamules, from Svalbard and F. viridescens P. M. Jorg. & Zhurb. the first example of a species with a green photobiont in this genus, from Siberia and Alaska.

The following corrections and amendments are made to the 2016 classification of lichenized fungi published in the previous issue of this journal. Four families are added: Harpidiaceae (Pezizomycotina incertae sedis), with the two genera Euopsis and Harpidium; Pleomassariaceae (Pleosporales), with the genus Splanchonema; Squamarinaceae (Lecanorales), with the two genera Herteliana (moved from Ramalinaceae) and Squamarina (moved from Stereocaulaceae); and Trichosphaeriaceae (Sordariomycetes: Trichosphaeriales), with the genus Cresporhaphis. The following previously overlooked genera are also added: Allophoron (Pezizomycotina incertae sedis), Cresporhaphis (Trichosphaeriaceae), Gabura (Arctomiaceae), Julella (Trypetheliaceae), Knightiella (Icmadophilaceae), Porpidinia (Lecideaceae), Protoroccella (Roccellaceae), Psoromidium (Pannariaceae) and Tremotylium (Arthoniales incertae sedis). The classification is adjusted for four genera: Asteroporum (moved from Pezizomycotina incertae sedis to Dothideomycetes incertae sedis), Eremastrella (moved from Psoraceae to Lecideaceae), Hosseusia (moved from Pannariaceae to Lecanoromycetes incertae sedis) and Joergensenia (moved from Lecanorales incertae sedis to Pannariaceae). Further, the following overlooked generic synonyms are listed: Buscalionia (= Marcelaria [nom. cons. prop.]), Degeliella (= Psoromaria), Dirinastrum (= Buellia), Gymnographa (= Phaeographis), Kroswia (= Fuscopannaria), Marfloraea (= Lepra), Medusulina (= Fissurina), and Phaeographina (= Pliariona); the genus Anapyrenium is discussed as a potential synonym of Thelomma. Species numbers are adjusted for nine genera: Austrella (Pannariaceae; 3 spp.), Icmadophila (Icmadophilaceae; 5 spp.), Lepidocollema (Pannariaceae; 23 spp.), Massalongia (Massalongiaceae; 6 spp.), Parmeliella (Pannariaceae; 70 spp.), Psoromidium (Pannariaceae; 1 spp.), Pyrgillus (Pyrenulaceae; 7 spp.), Siphula (Icmadophilaceae; 17 spp.) and Synarthonia (Arthoniales incertae sedis; 5 spp.). The fossil lichen Honeggeriella (complexa) is validated by adding MycoBank registration numbers, the validity of the genus name Pallidogramme (Graphidaceae) is discussed and confirmed, and the authorship of the name Thallinocarpon (Lichinaceae) is clarified. Several genera are (continued to be) considered non-lichenized, namely Chaenothecopsis (Eurotiomycetes: Mycocaliciales: Sphinctrinaceae), Limboria (newly lectotypified with L. constellata; Pezizomycotina incertae sedis), Naetrocymbe (Dothideomycetes: Pleosporales: Naetrocymbaceae), and Obryzum (Dothideomycetes incertae sedis: Obryzaceae); the status of the genus Pleurotrema (Dothideomycetes incertae sedis: Pleurotremataceae) is also discussed. Seven genera are corrected to have molecular data available: Adelolecia, Aspiciliopsis, Aspilidea, Crocodia, Parasiphula, Vezdaea and Xylopsora. With these corrections, the number of lichenized species is now tabulated at 19,409 and the number of fungal genera, families, and orders including lichens at 1,002, 119, and 40, respectively.

The Panariaceae sensu lato of North America are shown to contain 51 species in ten genera: Degelia (1), Erioderma (3), Fuscopannaria (25), Leioderma (1), Moelleropsis (1), Pannaria (8), Parmeliella (5), Protopannaria (1), Psoroma (3), and Santessoniella (3). The following new taxa are described: Fuscopannaria alaskana, F. aurita, F. coralloidea, F. crustacea, F. hookerioides, F. leprosa, F. pacifica, F. ramulina, F. thiersii, Pannaria lurida ssp. quercicola, P. subfusca, and Parmeliella appalachensis. The following new combinations proved necessary: Fuscopannaria californica (Tuck.), F. cheiroloba (Mull. Arg.), F. incisa (Mull. Arg.), Pannaria lurida ssp. russellii (Tuck.), Parmeliella stylophora (Vain.), Protopannaria (Gyeln.), Protopannaria pezizoides (G. H. Weber), and Santessoniella crossophylla (Nyl.). All names are typified and keys are provided to all taxa. The genus Fuscopannaria has an evolutionary center on the Pacific coast where it appears to have evolved taxa for most available niche...

Leioderma cherokeense P. M. Jorg. & Tonsberg sp. nov. is described from North Carolina, U.S.A., where it grows on bases of trunks of Liriodendron tulipifera. Apothecia and structures for vegetative dispersal are not known. The genus Leioderma is new to eastern North America.