Heterodermia antillarum (Vain.) Swinscow & Krog

Family :

Physciaceae

Swinscow & Krog, Lichenologist 8: 114. 1976

Basionym: Anaptychia granulifera var. antillarum Vainio, Suomal. Tiedeakat Toim, ser.  A, 6: 63. 1914

ID :

BU/BRL/2022/008

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

Upper Side:

Whitish gray to brownish gray, darker at the lobe apices, occasionally sparsely pruinose

Isidia :

Isidiate; isidia usually marginal, more rarely laminal, marginal isidia prominent at the periphery of the thallus, flattened to cylindrical, eventually becoming coralloid

Lower Side :

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

Medulla :

White, partly orange (decomposed salazinic acid)

Rare, laminal, adnate to substipitate, 0.5–3.0 mm wide; margin densely mealy pruinose, becoming isidiate; disc concave, dark brown, epruinose

Apothecia :

Pachysporaria-type, ellipsoidal, 23–30 × 12–18 μm. Pycnidia ± common, immersed; conidia bacilliform, 4–6 × 1 μm

Ascospores :

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)

Chemistry :