Polyblastidium queenslandicum (Elix) Kalb, 2015

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. Polyblastidium queenslandicum (Elix) Kalb , comb. nov. ( Fig. 11D )

Mycobank MB 813847

Basionym: Heterodermia queenslandica Elix, Australas. Lichenol. 67: 5 (2010b).

Type:— AUSTRALIA. Queensland: Mt. Baldy , 4 km SW of Atherton, 17°17’ S, 145°27’ E, 1080 m, on sapling along margin of regrowth rainforest, 25 June 1984, J.A. Elix 16310 & H. Streimann ( CANB!, holotype) .

Thallus foliose, orbicular to irregularly spreading, loosely adnate, to 8 cm wide. Lobes 0.5–2.0 mm wide, plane to weakly convex or weakly concave, sublinear-elongate, irregularly to subdichotomously branched, radiating; apices plane to subascending, usually discrete, with small lateral lobules; isidia and soredia absent. Upper surface greenish white, whitish or gray. Medulla white. Lower surface ecorticate, whitish to pale brown or, rarely, purple-black in the centre. Rhizines predominantly marginal or submarginal, pale gray to black, ±densely squarrosely branched, 1.0– 4.5 mm long. Apothecia laminal, substipitate to stipitate, 2.5–5.5 mm wide; margin densely lobulate, lobules to 2.5 × 2.0 mm; disc concave, pale to dark brown, epruinose or sparsely gray-pruinose. Ascospores Polyblastidia - type, ellipsoidal, with 0–3 sporoblastidia, 40–45 × 20–24 µm. Pycnidia common, immersed, visible as black dots; 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), 16β-acetoxyhopane-6α,22-diol (major), leucotylin (hopane-6α, 16β,22-triol) (major), 6α-acetoxyhopane-16β,22-diol (minor), norstictic acid (major), salazinolide (major), consalazinolide (minor).

Distribution and habitat:—Rare on bark in evergreen montane rainforest: also in Australia.

Remarks:—The species is characterized by narrow, sublinear-elongate lobes with an ecorticate lower surface, the absence of soredia and isidia but the presence of marginal lobules and the presence of atranorin, zeorin, norstictic acid, salazinolide and consalazinolide.

Material from Thailand examined:— Chiang Mai: Lumphun, Mae On, descent from Doi Mon Larn to Mae Kam Pong village , in an evergreen montane rainforest, on bark of an unidentified tree, 1500 m, 18°51'22'' N, 99°22'02'' E, 19 March 2008, K. Kalb et al. (herb. Kalb 36966) .

Figures

FIGURE 11. A. Polyblastidium japonicum (scale 5 mm). B. Polyblastidium microphyllum (scale 5 mm). C. Polyblastidium propaguliferum (scale 5 mm). D. Polyblastidium queenslandicum (scale 5 mm). E. Polyblastidium togashii (scale 5 mm). F. Polyblastidium violostriatum (scale 5 mm).