Department of Botany,
Bharathiar University, Coimbatore - 641 046
Leucodermia leucomelos (L.) Kalb
Family :
Physciaceae
Mongkolsuk, Meesim, Poengsungnoen, Buaruang, Schumm & Kalb, Phytotaxa 235(1): 35 (2015) Basionym: Lichen leucomelos Linnaeus Sp. PI. ed. 2, 2: 1613. 1763.
ID :
BU/BRL/2022/022
Thallus :
Foliose to sub fruticose, often in loose rosettes or forming tangled mats, loosely adnate or, in part, unattached, 5–15 cm wide
Lobes :
0.5–4.0 mm wide, separate, ±plane, linear-elongate, ribbon-like, tangled, dichotomously branched, often ascending at the apices or, occasionally, the apices reflexed, with conspicuous long, gray to black simple or squarrosely branched marginal rhizines, 5–15 mm long
Upper Side:
Ivory to gray-white, smooth, epruinose
Isidia :
Lower Side :
Predominantly ecorticate, but with thickened corticated margins, canaliculate, arachnoid or powdery and then becoming sorediate, often with subapical soralia, white throughout or partially pinkish brown or, rarely, purple; yellow pigments absent
Medulla :
White
Rare, subapical to apical, sub stipitate to distinctly stipitate, 2–5 mm wide; margin crenulate to lobulate, the lobules triangular, to 3 mm long, often with sparse short black cilia along the margins of the lobules; disc concave, dark brown to black, ± white-pruinose
Apothecia :
Polyblastidia-type, ellipsoidal, with numerous small or large sporoblastidia, 31–50 × 15–24 μm. Pycnidia rare, immersed, visible as black dots; conidia
Ascospores :
Cortex K+ yellow, C–, KC–, P+ yellow; medulla K+ yellow then red, C–, P+ dark yellow; containing atranorin (major), zeorin (major), japonene (minor or trace), salazinic acid (minor), consalazinic acid (trace)
Chemistry :
