A new species of Megalaria (Ramalinaceae, Ascomycota) from Thailand, and recognition of subgenus Catillochroma Author Phraphuchamnong, Phimpisa Lichen Research Unit, Department of Biology, Faculty of Science, Ramkhamhaeng University, Ramkhamhaeng, Bangkok, 10240 Thailand Author Nelsen, Matthew P. https://orcid.org/0000-0002-6866-815X Negaunee Integrative Research Center and Grainger Bioinformatics Center, Field Museum of Natural History, 1400 S. DuSable Lake Shore Drive, Chicago, IL, 60605, USA Author Distefano, Isabel https://orcid.org/0000-0003-2655-1647 Negaunee Integrative Research Center and Grainger Bioinformatics Center, Field Museum of Natural History, 1400 S. DuSable Lake Shore Drive, Chicago, IL, 60605, USA Author Mercado-Diaz, Joel A. https://orcid.org/0000-0003-2193-0023 Negaunee Integrative Research Center and Grainger Bioinformatics Center, Field Museum of Natural History, 1400 S. DuSable Lake Shore Drive, Chicago, IL, 60605, USA & Committee on Evolutionary Biology, University of Chicago, 1025 E. 57 th Street, Chicago, IL 60637, USA Author Parnmen, Sittiporn https://orcid.org/0000-0002-0116-9436 Toxicology Center, National Institute of Health, Department of Medical Sciences, Ministry of Public Health, Tivanon Rd., Nonthaburi 11000, Thailand Author Rangsiruji, Achariya https://orcid.org/0000-0001-8471-3742 Department of Biology, Faculty of Science, Srinakharinwirot University, Bangkok, 10110 Thailand Author Buaruang, Kawinnat https://orcid.org/0000-0001-6759-7487 Lichen Research Unit, Department of Biology, Faculty of Science, Ramkhamhaeng University, Ramkhamhaeng, Bangkok, 10240 Thailand Author Luecking, Robert https://orcid.org/0000-0002-3431-4636 Botanischer Garten und Botanisches Museum, Freie Universitaet Berlin, Berlin, Germany Author Lumbsch, H. Thorsten https://orcid.org/0000-0003-1512-835X Negaunee Integrative Research Center and Grainger Bioinformatics Center, Field Museum of Natural History, 1400 S. DuSable Lake Shore Drive, Chicago, IL, 60605, USA tlumbsch@fieldmuseum.org text MycoKeys 2022 2022-11-04 93 149 163 http://dx.doi.org/10.3897/mycokeys.93.90962 journal article http://dx.doi.org/10.3897/mycokeys.93.90962 1314-4049-93-149 5467E6F76F355E778C033D56C96E43FD Megalaria phayapipakiana (Kalb) Lumbsch & Nelsen comb. nov. Catillochroma phayapipakianum Kalb., Archive for Lichenology 30: 8-10 (2022).