Three new species and new records of foliicolous lichen genus Porina (Porinaceae, Ostropales) and artificial key to species from Thailand

Abstract

Foliicolous material of the lichenized genus Porina was collected in different types of forest in Thailand. Three new species were discovered: P. subatriceps Naksuwankul & Lücking, characterized by a yellowish brown, K+ reddish involucrellum and oblong, 7–11–septate ascospores, P. lumbschii Naksuwankul & Lücking, with large, muriform ascospores, and P. thailandica Naksuwankul & Lücking, having, small, oblong, 3–septate ascospores and a dark brown to black, K–involucrellum, morphologically close to P. homala and P. subhomala which differ by having 7–septate ascospores. An artificial key to species for a total of 55 taxa found in Thailand is provided and 20 new records are listed for the country.