Heterodermia antillarum (Vain.) Swinscow & Krog, Lichenologist

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

3. Heterodermia antillarum (Vain.) Swinscow & Krog, Lichenologist 8: 114 (1976) ( Fig. 6E )

Anaptychia granulifera (Ach.) Vain. var. antillarum Vain., Ann. Acad. Sci. Fenn., Ser. A 6(7): 63 (1915). Type:—INDIAS OCC. [Lesser Antilles]. Guadalupa [ Guadeloupe]: Camp-Jacob, sur les Inga laurifolia , 500–800 m, Duss 459 pr. p. (lectotype, selected by Kurokawa 1962, TUR-Vain 07737!); Anaptychia antillarum (Vain.) Kurok., J. Hattori Bot. Lab. 37: 596 (1973).

Thallus foliose, orbicular to irregularly spreading, adnate, comparatively small, up to 4 cm wide. Lobes 0.5–1.0 mm wide, to ca. 1.5–2.5 mm wide at the tips, ± plane, sublinear-elongate, usually richly sympodially branched, not ascending, eciliate, isidiate. Upper surface whitish gray to brownish gray, darker at the lobe apices, occasionally sparsely pruinose; isidia usually marginal, more rarely laminal, marginal isidia prominent at the periphery of the thallus, flattened to cylindrical, eventually becoming coralloid. Medulla white, partly orange (decomposed salazinic acid?). Lower surface corticate, whitish to pale brown, rarely dark gray, smooth to corrugated. Lower surface rhizines frequent, evenly distributed on the lower surface, simple or irregularly branched, usually short (ca. 1 mm long), pale to dark brown or black. Apothecia rare, laminal, adnate to substipitate, 0.5–3.0 mm wide; margin densely mealy pruinose, becoming isidiate; disc concave, dark brown, epruinose. Ascospores Pachysporaria - type, ellipsoidal, 23–30 × 12–18 µm. Pycnidia ± common, immersed; conidia bacilliform, 4–6 × 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 (minor), leucotylin (minor), salazinic acid (major), hypoconstictic acid (submajor), 3- O -methylconsalazinic acid (minor), consalazinic acid (minor).

Distribution and habitat:—Usually on bark in ± open situations in dry evergreen forest with dominating Fagaceae , also rarely on rock, also in Australia, Central America, the Caribbean, East Africa, South Africa and the Galapagos Islands.

Remarks:—characterized by the lobes with marginal and more rarely additional laminal isidia and the presence of salazinic acid and hypoconstictic acid in the medulla. The chemistry of this species is ± the same as that of H. albicans and it may be considered its non-sorediate, isidiate counterpart. H. tropica also has the same chemistry, but this species lacks any vegetative propagules.

Material reported from Thailand ( Aptroot et al. 2007: 104):— Chiang Mai: Doi Suthep-Pui National Park, Doi Suthep ridge, on bark of Fagaceae, Aptroot 55218.

Specimen examined: GUATEMALA. Retalhuleu: on free standing deciduous trees alongside a street SW of Retalhuleu, 500 m, 14°32’ N, 91°41’ W, 14 January 1979, K. Kalb & G. Plöbst (herb. Kalb 40303) .

THE LICHEN FAMILY PHYSCIACEAE IN THAILAND —II

Phytotaxa 235 (1) © 2015 Magnolia Press • 17

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).