Heterodermia archeri 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

1. Heterodermia archeri Elix, Australas. Lichenol. 68: 16 (2011a). ( Fig. 12A )

Type:— AUSTRALIA. Queensland; Flaggy Ck, Black Mountain Rd , 9 km NNW of Kuranda, 16°47’ S, 145°36’ E, 420 m, on felled trees along the rainforest margin, 7 July 1984, J. A . Elix 17595 & H . Streimann (holotype, CANB!) .

Thallus foliose, orbicular to irregularly spreading, loosely adnate, to 5 cm wide. Lobes 0.5–1.2 mm wide, broadening to ca. 2−3 mm wide at the tips and becoming paddle-shaped, plane to weakly convex, sublinear-elongate, irregularly to subpalmately branched, radiating; apices ± ascending, with lateral simple, white, 0.5–1.2 mm long rhizines visible from above. Upper surface greenish white, whitish to cream-colored, sorediate; soredia farinose to granular, in labriform soralia, occasionally to 5 mm wide and spathulate. Medulla white. Lower surface ecorticate, whitish at the margins, darkening to pale brown centrally. Rhizines marginal, simple or becoming richly branched, white or creamish, 0.5–2.0 mm long. Apothecia and pycnidia not seen.

Chemistry:—Cortex and medulla K + yellow, C –, KC–, P + pale yellow; containing atranorin (major), zeorin (major), 6α-acetoxyhopane-16β,22-diol (minor), 6α-acetoxy-16β,22-dihydroxyhopane-25-oic acid (minor), testacein (minor).

Distribution and habitat:—Rare on twigs and on bark of trees ( Shorea sp. is reported) in dry evergreen forest

THE LICHEN FAMILY PHYSCIACEAE IN THAILAND —II

Phytotaxa 235 (1) © 2015 Magnolia Press • 49 and hill evergreen forest from 300 to 1210 m above sea level; also in Australia and Papua New Guinea; new addition to the Thai lichen biota.

Remarks:—characterized by the loosely adnate thallus with narrow, sublinear-elongate lobes with pale marginal rhizines and spathulate soralia on some of the subascending lobe apices, a white, ecorticate lower surface and the presence of testacein.

Material from Thailand examined:— Sakon Nakhon: Phu phan National Park; Tha are Pha Nang Mern, 300 m, 17°03'43'' N, 103°58'23'' E, on bark of Shorea sp. in a dry evergreen forest, 7 October 1997, P. Mongkolsuk 8974 ( RAMK 21893)— Phetchaburi: Kaeng Krachan, along trail Khao Phanoenthung before km 36, in hill evergreen forest, on bark of unidentified tree, 1210 m, 12°53'07'' N, 99°37'53'' E, 12 February 2006, S. Meesim RU-DK 118, ( RAMK 21845).

Figures

FIGURE 12. A. Heterodermia archeri, holotype (scale 5 mm). B. Heterodermia galactophylla, apothecia with ciliate exciple (scale 1 mm). C. Heterodermia hypochraea, holotype (scale 5 mm). D. Heterodermia incana (scale 5 mm). E. Heterodermia podocarpa (scale 1.5 mm). F. Heterodermia stellata, lectotype (scale 1 mm).