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 1. Leucodermia borphyllidiata Kalb & Meesim , sp. nov. ( Figs. 9E, 9F ). Mycobank MB 813836 Similar to Leucodermia boryi , but differs in having lobes with marginal phyllidia. Type :— BRAZIL . Minas Gerais : Serra da Mantiqueira ; some km outside Vila Monte Verde , ca. 40 km E of Camanducaia , in a montane rainforest, 1800 m , 22°45’ S , 46°05’ W , 29 November 1980 , K . Kalb 39847 ( CGMS , holotype ) . Etymology :—The name is composed of bor [yi], indicating the similarity to Leucodermia boryi , and phyllidiata, indicating the presence of phyllidia in this taxon as they are a very useful diagnostic character. Thallus foliose to subfruticose, in loose rosettes or forming tangled mats, loosely adnate or, in part, unattached, 5–15 cm wide. Lobes 0.3–0.5 mm wide, separate, ± plane, linear-elongate, ribbon-like, tangled, dichotomously branched, with circinately revolute tips to the distal lobes, ornated with dorsiventral phyllidia; with conspicuous gray to black simple or sparingly branched marginal rhizines, 5–15 mm long. Upper surface ivory to gray-white, smooth. Medulla white. Lower surface mostly ecorticate, canaliculate, powdery, but not sorediate, white THE LICHEN FAMILY PHYSCIACEAE IN THAILAND —II Phytotaxa 235 (1) © 2015 Magnolia Press • 33 throughout or partially pinkish brown; pigments absent; lower margins thickened, corticated. Apothecia and pycnidia not seen Chemistry: Cortex K+ yellow, C–, KC–, P+ yellow; medulla K+ yellow, C–, P– or P+ pale yellow; containing atranorin (major), zeorin (major), japonene (minor or trace). Distribution and habitat :—Probably a rare species with a pantropical distribution. As far as we can estimate from the few collections we have, L. borphyllidiata occurs on the bark of trees or over mosses in montane tropical rainforests up to the timberline. Remarks : — As in other phyllidiate species, in L. borphyllidiata too, the phyllidia readily break off and leave soralia-like white spots which develop new phyllidia with age. These phyllidia may be very narrow and resemble isidia. Specimens examined :— SPAIN . Canary Islands : La Gomera ; S chumm 9271 ; BRAZIL . Minas Gerais : Serra da Mantiqueira ; Vila Monte Verde , ca. 30 km E of Camanducaia , on a Podocarpus tree in a dark and humid rainforest along a rivulet, 1500 m , 22°50’ S , 46°00’W , 20 August 1978 , K . Kalb & G . Plöbst (hb. Kalb 37795) ;— KENYA . Central Province : Nyeri District , Aberdare National Park , on the ground over mosses between shrubs, 3300 m , 11 August 1985 , K . Kalb & A . Schrögl (hb. Kalb 13918) ;— CHINA . Xizang : SE Tibet ; Tsangpo Vy. , Nangxian-Mainling, Vy. 10 km W of Gyemdong (High Camp 13), undisturbed Betula-Abies forest on N-facing steep boulder slope, on mosses on bark, 3570 m , 28°56' N , 93°14' E , 5 August 1994 , Miehe 94-149-41/01 & Wündisch ( GZU ) ;— THAILAND . Kamphaeng Phet : Maewong , along trail Chong Yen , on an unidentified tree in an evergreen montane rainforest, 1340 m , 16°06'03.42'' N , 99°06'26.95'' E , 2 May 2006 , S . Meesim 18 , ( RAMK 21721 ); ibid., S . Meesim 19 , ( RAMK 21722 ) .