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Family: PeltigeraceaeGenus: Lobaria
Thallus wide-spreading, often exceeding 30 cm diam., ± loosely attached at one end, at times pendulous and strap-shaped; lobes 1-3 cm wide, ± dichotomously divided, often rather elongate, sinuate-indented with truncate apices; upper surface pale green-brown when dry, bright green when wet, strongly reticulately ridged with marked depressions, often with coarse soredia or isidia along ridges; lower surface tomentose, brown, with naked, paler, convex areas corresponding to depressions of upper surface; photobiont green algae (Dictyochloropsis), often with cyanobacteria in internal cephalodia in the medulla.
Anamorph: conidiomata pycnidia, on the thallus ridges, immersed; conidia 5 × 1 μm, bacilliform.
Teleomorph: ascomata apothecia, occasional, on ridges and towards the margin; disc 2-4 mm diam., reddish brown, with thin thalline margin. Ascospores 18-30 × 5-9 μm, colourless or pale brown, fusiform, (1-)3(-5)-septate.
Chemistry: medulla C–, K+ yellow-orange, KC+ yellow-orange, Pd+ orange, (stictic [major], constictic [major or submajor], norstictic [minor], cryptostictic [minor], and salazinic [trace] acids + related trace substances).