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 5. Heterodermia incana (Stirt.) D.D. Awasthi , Geophytology 3(1): 114 (1973) ( Fig. 12D ) Physcia incana Stirt., Proc. Roy. Philos. Soc. Glasgow 11: 322 (1879) ; Anaptychia incana (Stirt.) Zahlbr., Cat. Lich. Univ. 7: 727 (1931) ; Type:— INDIA . Darjeeling; J.A. Thomson 13 ( holotype , BM n.v.). Thallus foliose, forming small rosettes or tufts of suberect to ascending lobes, 3–6 cm wide. Lobes 1–4 mm wide, irregularly to subdichotomously branched, convex, epruinose or slightly pruinose at the tips, not ciliate. Upper surface grayish white, sometimes darkening at the centre, soralia and isidia absent. Marginal rhizines whitish, somewhat darkening at the tips, squarrosely or fruticosely branched. Medulla white. Lower surface ecorticate, arachnoid, uniformly white. Apothecia commonly numerous, pedicellate, subterminal, 1–8 mm wide, margins smooth to lacinulate, sometimes ciliate, disc darkbrown, densely white pruinose. Ascospores Polyblastidia - type , ± constricted at the centre with 2–3 small sporoblastidia 52–56 × 22–27 µm. Chemistry: Cortex K+ yellow, C–, KC–, P+ yellow; medulla K+ yellow, C–, P–; atranorin (major) and zeorin (major). Distribution and habitat :—This rare species occurs on bark of unidentified trees in lower montane scrub and coniferous forest from 1470 to 1520 m above sea level; also in Taiwan , Java, India and Nepal . Remarks :— H. incana is similar to H. himalayensis (D.D. Awasthi) D.D. Awasthi , but differs in lacking norstictic acid. Material from Thailand examined :— Loei : Phuluang Wildlife Sanctuary , area of Kok Nok Kraba and Ban Po Ra Dok , in lower montane scrub, on bark of unidentified tree, 1470 m , 17°16'46'' N , 101°31'08'' E , 29 August 2005 , S. Meesim & K. Buaruang , RU-WD155 , ( RAMK 21183 ) ; area of Kok Nok Kraba , along trail from Pha Chang Parn to Pha Taloen , in lower montane scrub, on bark of unidentified tree, 1470 m , 17°16'46'' N , 101°31'08'' E , 24 June 2008 , S. Meesim & K. Buaruang , RU-MS 76.1, ( RAMK 21081 ) ; ibid , in lower montane scrub, on bark of unidentified tree, 1470 m , 17°16'46'' N , 101°31'08'' E , 13 November 2009 , S. Meesim & K. Buaruang , RU-MS0265 , ( RAMK 20682 ) ; area of Lan Suriyan , in lower montane scrub, on bark of unidentified tree, 1470 m , 17°16'44'' N , 101°31'07'' E , 25 June 2009 , S. Meesim & K. Buaruang , RU-MS29.1 , ( RAMK 21022 ) ; forest protection unit, along trail to Tae , area of Pak Dum , in coniferous forest, on bark of unidentified tree, 1520 m , 17°15'07'' N , 101°31'05'' E , 29 August 2005 , S. Meesim & K. Buaruang , RU-MSPL 591 , ( RAMK 21124 ) .