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Leucodermia boryi (Fée) Kalb

Family :

Physciaceae

Mongkolsuk, Meesim, Poengsungnoen, Buaruang, Schumm & Kalb, Phytotaxa 235(1): 34 (2015)

Basionym: Borrera boryi Fee, Essai Crypt. Ecorc. Offic. Introduction 96, 1824

ID :

BU/BRL/2022/021

Thallus :

Foliose to sub fruticose, often in loose rosettes or forming tangled mats, loosely adnate or, in part, unattached, 5–15 cm wide

Lobes :

0.4–3.0 mm wide, separate, ± plane, linear-elongate, ribbon-like, tangled, dichotomously branched, often ascending at the apices or, occasionally, the apices reflexed or with circinately revolute tips to the distal lobes, with conspicuous gray to black simple or sparingly branched marginal rhizines, 5–15 mm long

Upper Side:

Ivory to gray-white, smooth

Isidia :

​

Lower Side :

Mostly ecorticate, canaliculate, arachnoid or powdery, but not sorediate, white throughout or partially pinkish brown or rarely purple; yellow pigments absent; lower margins thickened, corticated

Medulla :

White 

± common, subapical to apical, sub stipitate to distinctly stipitate, 1–5 mm wide; margin crenulate to lobulate, lobules triangular, to 2 mm long, often with sparse short black cilia; disc concave, dark brown, ± distinctly white-pruinose

Apothecia :

Polyblastidia-type, ellipsoidal, with numerous small and/or large sporoblastidia, 35–53 × 18–25 μm. Pycnidia rare, immersed, visible as black dots; conidia bacilliform, 4–5 × 1 μm

Ascospores :

Cortex K+ yellow, C–, KC–, P+ yellow; medulla K+ yellow, C–, P– or P+ pale yellow; containing atranorin (major), zeorin (major) and japonene (minor or trace)

Chemistry :

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