Heterodermia flabellata (Fée) D.D.Awasthi

Family :

Physciaceae

D. Awasthi, Geophytology 3: 113. 1973  

Basionym: Parmelia flabellata Fee. Suppl. Essai Crypt. Ecorc. Offic. : 122. 1837

ID :

BU/BRL/2022/012

Thallus :

Foliose, orbicular to irregularly spreading, moderately to loosely adnate, to 5 cm wide, but often coalescing to form colonies up to 15 cm wide

Lobes :

0.7–2.5 mm wide, ca. 2–4 mm wide at the tips, plane to weakly convex, sublinear to linear-elongate, regularly to irregularly branched, radiating; apices not ascending, contiguous to discrete, with short lateral lobes

Upper Side:

Gray-white to greenish white, ±partly blackened in the center

Isidia :

Lacking Soredia, Isidia and Pruina

Lower Side :

Ecorticate, with a superimposed layer of cotton-woolly hyphae, impregnated by yellow to orange-brown pigments, arachnoid. Marginal rhizines, black, simple or squarrosely branched, 1–2 mm long

Medulla :

White; lower medulla dark yellow to orange-brown

Common, laminal, sessile to sub stipitate, 1–6 mm wide; margin crenate at first, lobulate at maturity; inner surface of lobules ecorticate, yellow-orange pigmented; disc concave, dark brown to brown-black, epruinose or weakly white pruinose

Apothecia :

Polyblastidia-type, ellipsoidal, with 2–3 sporoblastidia present at maturity, 27–40 × 12–19 μm. Pycnidia common, immersed, then becoming emergent, visible as black dots; conidia bacilliform, 4–5 × 1 μm

Ascospores :

Cortex K+ yellow, C–, KC–, P+ yellow; upper medulla K+ yellow, C–, P–; lower surface K+ violet; containing atranorin (major), zeorin (major), 16β-acetoxyhopane-6α,22- diol (major), leucotylin (minor), 7- chloroemodin (minor), flavoobscurins A, B1, B2 (minor)

Chemistry :