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. Polyblastidium hypoleucum (Ach.) Kalb , comb. nov. ( Fig. 10F ) Mycobank MB 813843 Basionym: Parmelia speciosa b. hypoleuca Ach., Syn. Lich. : 211 (1814) . Type:— U.S.A. Pennsylvania , 29 November 1805 , Muhlenberg ( lectotype , selected by Moberg & Nash 1999: 5 , H) [for collection locality and date, see Lendemer & Hewitt 2002: 187]; Anaptychia hypoleuca (Ach.) A. Massal., Atti Soc. Ital. Sci. Nat. 11:615 (1869) ; Heterodermia hypoleuca (Ach.) Trevis., Atti Soc. Ital. Sci. Nat. 11: 615 (1869) . Thallus foliose, rarely orbicular, usually irregularly spreading, loosely adnate, to 9 cm wide. Lobes 0.3–1.0 mm wide, to ca. 1.5–2.5 mm wide at the tips, plane to weakly convex or weakly concave, sublinear-elongate, irregularly branched, radiating; apices not ascending, usually discrete, ± lobulate along the lobe margins, the lobules ± rounded, 0.1–0.2 mm wide, eciliate. Upper surface whitish to pale gray, without soralia, isidia or phyllidia. Medulla white. Lower surface ecorticate, ± compact, white to beige in the centre; yellow pigments absent. Marginal rhizines totally black or grayish at the base, simple or squarrosely branched, 1–3 mm long. Apothecia common, laminal, substipitate, 1–7 mm wide; margin crenulate to lobulate, the lobules ecorticate on the lower surface; disc concave, dark brown to brown-black, ± thinly gray pruinose. Ascospores Polyblastidia - type , ellipsoidal, mostly without polyblastidia, albeit in some specimens, almost one third of the spores are with polyblastidia, 23–33 × 12–17 µm. Pycnidia not seen. 42 • Phytotaxa 235 (1) © 2015 Magnolia Press MONGKOLSUK ET AL. Chemistry: Cortex K+ yellow, C–, KC–, P+ yellow; medulla K+ yellow, C–, P–; containing atranorin (major), zeorin (major), japonene (major). Nomenclature notes : — Some authors, e.g. Kurokawa (1962: 42) quote Parmelia hypoleuca Muhl., Cat. Pl. Amer. Sept. 1813:105 as basionym. But the genus Parmelia is outlined on p. 102 and no Parmelia hypoleuca is mentioned there. Distribution and habitat :—Occurs on bark of trees ( Betula alnoides and Acer pseudoplatanus are reported) in lower montane scrub, in lower montane rainforest and in hill evergreen forest in northern Thailand from 1185 to 1340 m above sea level; also recorded from North, Central and South America, Africa and Asia, e.g. Japan and China . Remarks:— The species is characterized by ± radiating lobe apices, with a whitish lower surface lacking lower cortex, the absence of vegetative propagules, ± small ascospores mostly without sporoblastidia and the lack of depsidones. Polyblastidium magellanicum is very similar, but is readily distinguished by larger ascospores invariably with polyblastidia. Material from Thailand examined : — Loei : Phuluang Wildlife Sanctuary , trail to Pa Kob Lon Tae forest protection, in lower montane scrub, on bark of unidentified tree, 1245 m , 17°11'32'' N , 101°33'43'' E 17°16'39'' N , 101°31'38'' E , 28 August 2008 , S . Meesim & K . Buaruang , RU-MSPL 710 , ( RAMK 21156 ); Loei : Phuluang Wildlife Sanctuary , Forest protection unit, area of Lon Tae , in lower montane scrub, on Acer pseudoplatanu , 1260 m , 17°14'18'' N , 101°33'19'' E , 12 November 2009 , S . Meesim & K . Buaruang , RU-MSPL 565, , ( RAMK 21122 ); Phitsanulok : Phu Hin Rong Kla National Park , area of Kang Han Nam water fall, in lower montane rain forest, on bark of unidentified tree, 1185 m , 16°59'31'' N , 100°00'44'' E , 4 June 2003 , T . Dia , RU-TD 25, ( RAMK 21585 ); Kamphaeng Phet : Maewong , along trail Chong Yen , in hill evergreen forest, on Betula alnoides , 1340 m , 16°06'03'' N , 99°06'27'' E , 2 May 2006 , S . Meesim RU-MW 16, ( RAMK 21734 ); Nakon Ratchasima : Khao Yai National Park , along the trail Pha Deaw Dai , in hill evergreen forest, on bark of unidentified tree, 1280 m , 14°22'28'' N , 101°23'04'' E , 10 January 1999 , R . Noicharoen RU-16065, ( RAMK 5559 ) .