Polyblastidium japonicum (M. Satô) 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

6. Polyblastidium japonicum (M. Satô) Kalb , comb. nov. ( Fig. 11A )

Mycobank MB 813844

Basionym: Anaptychia dendritica var. japonica M. Satô, J. Jap. Bot. 12: 427 (1936); Anaptychia japonica (Satô) Kurok., Beih. Nova Hedwigia 6: 58 (1962). Type:— TAIWAN. Mt. Arisan, Mingestu, 24 Jan. 1936, M. Satô (Taiwan 10); TI n.v. Heterodermia japonica (M. Satô) Swinscow & Krog, Lichenologist 8: 122 (1976).

Thallus foliose, irregularly spreading to ± orbicular, loosely adnate, to 5 cm wide, often coalescing to form colonies up to 15 cm wide. Lobes 0.7–2.0 mm wide, to ca. 2–4(–5) mm wide at the tips, plane to weakly convex or weakly concave, sublinear-elongate, dichotomously branched, radiating; apices ascending, usually discrete, ± lobulate along the lobe margins, lobules ±rounded or sparingly branched, 0.3–0.8 mm wide, rarely with small soralia. Upper surface greenish white, whitish to pale gray, sorediate; soredia farinose to granular, soralia labriform to capitate, on lateral and terminal lobes, occasionally spreading along lobe margins. Medulla white. Lower surface ecorticate, ± compact, white to violet-black in the centre; yellow pigments absent. Rhizines marginal, black, simple or squarrosely branched, 1–3(–7) mm long. Apothecia very rare, laminal, substipitate, 1–8 mm wide; margin lobulate, lobules ecorticate, partly yellow on the lower surface, apically sorediate; disc concave, dark brown to brown-black, ± gray pruinose. Ascospores Polyblastidia - type, ellipsoidal, with 2–3 sporoblastidia, 40–45 × 20–23 µm. Pycnidia common, 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), japonene (major), 16β-acetoxyhopane-6α,22-diol (trace), 6α-acetoxy-22-hydroxyhopane-25-oic acid (trace), anaptychin 5 (minor).

Distribution and habitat:—This is a very rare species in Thailand. It was collected on bark of Cinchona pubescens and on bark of Fagaceae in hill evergreen forest. A pantropical and pantemperate species.

Remarks:— This species is characterized by sorediate upper surface, ± radiating lobe apices, the absence of a lower cortex, the white to blackish violet lower surface, ascospores with sporoblastidia and the presence of atranorin and triterpenes. It was not present amongst the material we investigated, but has been reported by Aptroot et al. (2007: 105). As no chemistry was given in that paper, the data may refer to the depsidone containing, P. propaguliferum .

THE LICHEN FAMILY PHYSCIACEAE IN THAILAND —II

Phytotaxa 235 (1) © 2015 Magnolia Press • 43

Material reported from Thailand:— Chiang Mai: Doi Suthep-Pui National Park , in a medicinal garden on bark of Cinchona pubescens , 1100 m, 18°48'17'' N, 98°54'43'' E, 12 October 2002, A . Aptroot 55188 ( ABL); Doi Suthep-Pui National Park, Doi Suthep ridge, Doi Suthep , San Khu summit, in montane oak forest on ridge, on bark of Fagaceae , 1500 m, 18°48'56'' N, 98°53'41'' E, 13 October 2002, A . Aptroot 55214 ( ABL) .

Selected specimens examined:— PHILIPPINES. Mindanao: Cotabato province; between Lake Venado and the peak of Mt. Apo, 2200–2800 m, 07°00'– 06°59' N, 125°16.17– 125°20' E, 12 June 2000, F. Schumm & Schwarz (herb. Schumm 6175)—MASCARENE ISLANDS. Réunion: Street from le Vingt-Septième and Piton de la Furnaise, in a small population of Sophora denudata and Philippia montana , 2250 m, 21°13'' S, 55°39' E, 29 August 1991, K. & A. Kalb (herb. Kalb 33709)— BRAZIL. Rio de Janeiro: Serra da Mantiqueira; Itatiaia, Parque National do Itatiaia, at the headquarters of the N. P. on palm tree, 800 m, 22°20’ S, 44°35’ W, 21 July 1978, K. Kalb & G. Plöbst (herb. Kalb 40306)— Costa Rica. Puntarenas: Fila Cruces Ridge, surroundings of Las Cruces Tropical Botanical Garden, ca. 4 km SSE of San Vito, in a premontane rainforest, 1300 m, 31 December 1978, K. Kalb & G. Plöbst (herb. Kalb 37785).

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).