Heterodermia angustiloba (Müll. Arg.) D.D. Awasthi, Geophytology

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

2. Heterodermia angustiloba (Müll. Arg.) D.D. Awasthi, Geophytology 3(1): 113 (1973) ( Fig. 6D )

Physcia speciosa (Wulfen) Müll. Arg. var. angustiloba Müll. Arg. , Flora 66: 78 (1883). Type:— AUSTRALIA. Queensland: prope Toowoomba, Hartmann (holotype G, fide Elix 2011c); Pseudophyscia speciosa (Wulfen) Müll. Arg. var. angustiloba (Müll. Arg.) Müll. Arg., Bot. Jahrb. 20: 259 (1894c); Anaptychia speciosa (Wulfen) A. Massal. var. angustiloba (Müll. Arg.) Zahlbr., Cat. lich. univ. 7: 741 (1931); Anaptychia angustiloba (Müll. Arg.) Kurok., Beih. Nova Hedwigia 6: 39 (1962).

THE LICHEN FAMILY PHYSCIACEAE IN THAILAND —II

Phytotaxa 235 (1) © 2015 Magnolia Press • 15 Thallus foliose, orbicular to irregularly spreading, loosely adnate, 4–6 cm wide, but sometimes thalli coalescing and forming larger colonies. Lobes short and narrow, 0.5–1.2 mm wide, rather flexuose and discrete at the periphery, ± plane to weakly convex, sublinear-elongate, repeatedly di- or trichotomously branched, eciliate, lacking isidia, phyllidia and soralia, with distinct pseudocyphellae along the margins of the lobes. Upper surface grayish white to gray, epruinose. Medulla white. Lower surface with pseudocortex, whitish to pale brown, dark

16 • Phytotaxa 235 (1) © 2015 Magnolia Press

MONGKOLSUK ET AL.

gray-brown near the centre, smooth. Lower surface rhizines absent or rare, marginal rhizines frequent, concolorous with the thallus or darkening near the apices, not or irregularly branched, 1–3 mm long. Apothecia laminal, substipitate to subsessile, 0.5–2.5 mm wide; margin ± crenate with pseudocyphellae; disc concave, brown to blackish brown, weakly gray-pruinose. Ascospores Pachysporaria - type, ellipsoidal, 25–30 × 13–15 µm. Pycnidia common, immersed; conidia bacilliform, 4–5 × 1 µm.

Chemistry: Cortex K+ yellow, C–, KC–, P+ yellow; medulla K+ yellow then red, C–, P+ yellow-orange; containing atranorin (major), zeorin (major), dissectic acid (submajor), 16β- acetoxyhopane-6α,22-diol (major), leucotylin (minor), 6α-acetoxyhopane-16β,22-diol (major), 6α,16β-diacetoxyhopane-22-ol (minor), norstictic acid (major), connorstictic acid (minor), salazinic acid (minor or trace).

Distribution and habitat:—Occurs on bark and rocks in lower montane scrub, hill evergreen forest and lower montane rainforest, also in Australia, India, Nepal, Vietnam, China and Japan; new addition to the Thai lichen biota.

Remarks:—Characterized by the narrow lobes with marginal rhizines, a lower surface with a pseudocortex, rhizines sparse or absent, the absence of isidia, phyllidia and soralia and the presence of norstictic and dissectic acids.

Material from Thailand examined:— Phitsanulok: Phu Hin Rongkla, forest protection unit Man Daeng, in lower montane forest, on rock, 1610 m, 16°55'51'' N, 101°03'04'' E, 16 July 2004, P. Mongkolsuk RU-PM 255/1, ( RAMK 21811 ); Loei: Phuluang Wildlife Sanctuary , along the trail in Kok Promachan area , in lower montane scrub, on rock, 1560 m, 17°16'39'' N, 101°31'38'' E, 28 August 2008, S . Meesim & K . Buaruang, RU-MS 32.1, ( RAMK 21031 ); Nan: Doi Phu Kha, area of view point at Doi Phu Kha , in hill evergreen forest, on bark of Toona ciliata , 1470 m, 19°18'13'' N, 101°09'55'' E, 10 May 2006, S . Meesim RU-DK 26, ( RAMK 21842 ) .

Figures

FIGURE 6. A. Polyblastidium hypoleucum, ascospores (mostly) without sporoblastidia (scale 10 µm). B. Polyblastidium magellanicum, Polyblastidia-type ascospores with one or more sporoblastidia (scale 10 µm). C. Heterodermia tropica, black conidiomata, immersed in the thallus or slightly emergent (scale 1 mm). D. Heterodermia angustiloba (scale 5mm). E. Heterodermia antillarum (scale 1 mm). F. Heterodermia coralloidea, holotype (scale 5 mm).