The lichen family Physciaceae in Thailand-II. Contributions to the genus Heterodermia sensu lato Author Mongkolsuk, Pachara Lichen Research Unit, Biology Department, Faculty of Science, Ramkhamhaeng University, Ramkhamhaeng 24 road, Bangkok, 10240 Thailand. Author Meesim, Sanya Lichen Research Unit, Biology Department, Faculty of Science, Ramkhamhaeng University, Ramkhamhaeng 24 road, Bangkok, 10240 Thailand. Author Poengsungnoen, Vasun Lichen Research Unit, Biology Department, Faculty of Science, Ramkhamhaeng University, Ramkhamhaeng 24 road, Bangkok, 10240 Thailand. Author Buaruang, Kawinnat Lichen Research Unit, Biology Department, Faculty of Science, Ramkhamhaeng University, Ramkhamhaeng 24 road, Bangkok, 10240 Thailand. Author Schumm, Felix Mozartstrasse 9, D- 73117 Wangen, Germany. Author Kalb, Klaus Lichen Research Unit, Biology Department, Faculty of Science, Ramkhamhaeng University, Ramkhamhaeng 24 road, Bangkok, 10240 Thailand. & Lichenologisches Institut Neumarkt, Im Tal 12, D- 92318 Neumarkt, Germany. Email: klaus. kalb @ arcor. de & Lichen Research Unit, Biology Department, Faculty of Science, Ramkhamhaeng University, Ramkhamhaeng 24 road, Bangkok, 10240 Thailand. & University of Regensburg, Institute of Plant Sciences, Universitätsstraβe 31, D- 39040 Regensburg, Germany Corresponding author-email: pm-tamrapap @ ru. ac. th & Lichen Research Unit, Biology Department, Faculty of Science, Ramkhamhaeng University, Ramkhamhaeng 24 road, Bangkok, 10240 Thailand. klaus.kalb@arcor.de text Phytotaxa 2015 2015-11-20 235 1 448 450 http://dx.doi.org/10.11646/phytotaxa.235.1.1 journal article 10.11646/phytotaxa.235.1.1 1179-3163 13631327 Leucodermia appalachensis (Kurok.) Kalb , comb. nov. Mycobank MB 813829 36 • Phytotaxa 235 (1) © 2015 Magnolia Press MONGKOLSUK ET AL. Basionym: Anaptychia appalachensis Kurok., Beih. Nova Hedwigia 6: 83 (1962) . Type:— U.S.A. West Virginia : Hardy Co., Fabius, on base of chestnut oak, July 1956 , Hale 12069 ( holotype , US ); Heterodermia appalachensis (Kurok.) W.L. Culb., Bryologist 69: 479 (1967 [1966]). Chemistry: Cortex K+ yellow, C–, KC–, P+ yellow; medulla K+ yellow, C–, P– or P+ pale yellow; containing atranorin (major), zeorin (major), 6α-acetoxyhopane-16β,22-diol (submajor), appalachin (major). Remarks : — Although we did not see the type , we did study authentic material from West Virginia and from other localities in the Appalachian Mountains. Appalachin is a new lichen substance of unknown composition; it is not a terpene most probably not the yellowish pigment reported for this species. Although we have recognized the latter in many specimens, we could not detect it on TLC plates after the solvents were evaporated. Appalachin seems to be a very rare compound in Heterodermia sens.lat., for despite analyzing more than one thousand specimens, we have only found it in L. appalachensis and one other specimen (RAMK 21767), which we tentatively have identified as Polyblastidium hypoleucum . Selected specimens examined :— U.S.A. West Virginia : Pendleton Co. ; 6 mi. W of Sugar Grove , base of trees, mountain sloppes, C . F . Reed 75688 ( NY ) ; North Carolina : Swain Co. ; Great Smoky Mountains National Park , Sunkota Ridge , Ridge top forest with hardwoods dominant, on Quercus base, 2200–3400 ft. , 35°29'42'' N , 83°24'46'' W , 21 June 2011 , J . Lendemer 29427 ( NY ) .