Heterodermia koyana (Kurok.) Elix, Australas. Lichenol.

Mongkolsuk, Pachara, Meesim, Sanya, Poengsungnoen, Vasun, Buaruang, Kawinnat, Schumm, Felix & Kalb, Klaus, 2015, The lichen family Physciaceae in Thailand-II. Contributions to the genus Heterodermia sensu lato, Phytotaxa 235 (1), pp. 448-450 : 448-450

9. Heterodermia koyana (Kurok.) Elix, Australas. Lichenol. 66: 61 (2010a) ( Fig. 8A )

Anaptychia dissecta Kurok. var. koyana Kurok., J. Jap. Bot. 34(6): 183 (1959); Type : JAPAN. Kii : Mt. Koya, 4 April 1956, Kurokawa 56027 (holotype TNS, fide Kurokawa 1959); Heterodermia dissecta Kurok. var. koyana (Kurok.) D.D. Awasthi, Geophytology 3: 113 (1973).

Thallus foliose, orbicular to irregularly spreading, loosely adnate, 5–10 cm wide. Lobes 0.7–2.0 mm wide, plane to weakly convex or weakly concave, sublinear-elongate, sympodially to subdigitately branched; apices not ascending, ± discrete to contiguous at the periphery, with short lateral lobes, eciliate. Upper surface gray-white to gray, epruinose, with marginal phyllidiate isidia or dorsiventral lobules, rarely becoming granular; marginal lobules occasionally minutely dissected, rarely granular near the tips, or the entire lobule becoming granular and appearing sorediate. Medulla white. Lower surface with a pseudocortex, white to grayish or pale brown in the centre. Lower surface rhizines absent or very rare, marginal rhizines numerous and partly projecting beyond the lobe margins, irregularly branched, concolorous with the thallus or darkening and forming a dense black marginal mat. Apothecia very rare, laminal, sessile to substipitate, 1–5 mm wide; margin lobulate-phyllidiate; disc concave, brown to brown-black, epruinose. Ascospores Pachysporaria - type, ellipsoidal, 28–32 × 12–16 µm. Pycnidia initially immersed, then becoming emergent, visible as black dots; conidia bacilliform, 4–5 × 1 µm.

Chemistry: Cortex K+ yellow, C–, KC–, P+ yellow; medulla K+ yellow, C–, P–; containing atranorin (major), zeorin (major), 16β-acetoxyhopane-6α,22-diol (major), 6α-acetoxyhopane- 16β,22-diol (trace), leucotylin (minor), dissectic acid (minor).

Distribution and habitat:—Occurs on rocks and bark of unidentified trees in mixed deciduous forest, lower montane scrub and hill evergreen forest from 880–1470 m above sea level; also in Australia, Central America?, India and Japan; new addition to the Thai lichen biota.

Remarks:—characterized by the minutely dissected marginal lobules and/or phyllidia, the pseudocorticate lower surface, the presence of dissectic acid and the absence of norstictic acid. Heterodermia dissecta is morphologically very similar, but it contains additionally norstictic acid and more commonly develops granularsorediate phyllidiate isidia.

Material from Thailand examined:— Loei: Phuluang Wildlife Sanctuary, Phuluang Wildlife Research Station, area of Maenam Sarn , in mixed deciduous forest, on rock, 880 m, 17°20'36'' N, 1ss 1°30'17'' E, 11 November 2009, S . Meesim & K . Buaruang, RU-MS 0294, ( RAMK 20980 ); Loei: Phuluang Wildlife Sanctuary, area of Kok Nok Kraba along trail to channel 7, in lower montane scrub, on bark of unidentified tree, 1470 m, 17°16'46'' N, 101°31'08'' E, 30 August 2005, W . Hongsachart WD 207, ( RAMK 21899 ); Loei: Phuluang Wildlife Sanctuary, area of Kok Nok Kraba along trail to Pha Som Ded and 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 14, ( RAMK 20998 ); Kamphaeng Phet: Maewong, along trail Chong Yen , in hill evergreen forest, on bark of unidentified tree, 1340 m, 16°06'04'' N, 99°06'27'' E, 2 May 2006, S . Meesim, RU-MW 18, ( RAMK 21825 ) .

24 • Phytotaxa 235 (1) © 2015 Magnolia Press

MONGKOLSUK ET AL.

Figures

FIGURE 8. A. Heterodermia koyana (scale 5 mm). B. Heterodermia koyanoides (scale 5 mm). C. Heterodermia lepidota (scale 5 mm). D. Heterodermia pseudospeciosa (scale 5 mm). E. Heterodermia rubescens (scale 5 mm). F. Heterodermia rugulosa (scale 5 mm).