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 6. Heterodermia pandurata (Kurok.) J.C. Wei , An enumeration of lichens in China : 112 (1991) Anaptychia pandurata Kurok., Beih. Nova Hedwigia 6: 95 (1962) ; Type :— JAPAN . Province Kii : Mt. Koya , 18 April 1926 , Y. Numaziri 597 ( holotype , TNS , n.v.) . Thallus foliose to subfruticose, forming small rosettes or irregularly spreading, adnate to loosely adnate, 2–6 cm wide. Lobes 0.5–2.0 mm wide, sublinear, convex, rarely flat or partly concave, irregularly branched, suberect or ascending at the apices, partially imbricate, discrete to contiguous. Upper surface grayish white or gray, epruinose; soredia and isidia absent. Medulla white. Lower surface ecorticate, arachnoid, ± canaliculate, white, partly or totally impregnated by an orange to orange-brown pigment. Marginal rhizines simple or irregularly branched, whitish or somewhat darker at the tips, 1–4 mm long. Apothecia common, substipitate to stipitate, 1–6 mm wide, subterminal on ascending lobes; margin crenate or with well-developed squamules, eciliate; disc brown to dark brown, often white pruinose. Ascospores Polyblastidia - type , ellipsoidal, with 2–3 sporoblastidia, 35–45 × 16–22 µm. Pycnidia not seen. THE LICHEN FAMILY PHYSCIACEAE IN THAILAND —II Phytotaxa 235 (1) © 2015 Magnolia Press • 53 Chemistry: Cortex K+ yellow, C–, KC–, P+ yellow; medulla K+ yellow then red, C–, P+ orange; orange pigment on lower surface K+ violet; containing atranorin (major), zeorin, 7-chloroemodin and dissectic acid. Distribution and habitat :—Rare on branches and bark of trees in Australia , Laos , Japan and probably in Thailand . Remarks :—At this time we cannot be sure that this species occurs in Thailand . It has been reported from Laos and could eventually be found in Thailand as well. Material reported from Thailand :—Hase Plantation, probably Laos ( Wolseley et al. 2002: 28 ).