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Melanelixia glabratula
Nomenclature
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Family: ParmeliaceaeGenus: Melanelixia
SUMMARY
Thallus 1-5(-10) cm diam., thin, closely appressed centrally but often free at margins, rosette-forming or irregular. Lobes to (2-) 3 (-4.5) mm wide, flat or occasionally with the apices ± upturned, elongate, contiguous or overlapping; margins crenate or irregularly incised. Upper surface green to olive brown, sometimes with a ± reddish tinge, shiny, especially towards lobe ends, isidiate. Isidia cylindrical, smooth, often becoming branched-coralloid, leaving a white area when abraded, usually numerous and often obscuring the centre of the thallus. Medulla white, sometimes with orange pigment (K+ purple [rhodophyscin]) especially in the lower part. Lower surface black, with pale brown, simple rhizines.
Anamorph: conidiomata pycnidial, the conidia bacilliform, ± swollen towards each end.
Teleomorph: ascomata apothecia, occasional, to 5 mm diam., often shortly stalked. Disc red-brown (green when wet), shiny. Thalline exciple often becoming isidiate. Ascospores 10-14 × 5.5-8 μm.
Chemistry: cortex K–, N–; medulla C+ red, K± purple, KC+ red, Pd–, UV– (lecanoric and 5-methoxylecanoric acids, rhodophyscin, unknowns).