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Lepraria lobata Elix & Kalb |
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Nomenclatural data
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In Elix, Mycotaxon 94: 220 (2005); type: Australia, Western Australia, slopes of Angwin Peak, Porongurups Range, Porongurups National Park, 34°40'S, 117°51'E, 16. Sept. 1994, J. A. Elix 41327, H. T. Lumbsch & H. Streimann (PERTH—holotypus).
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Morphology
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Thallus crustose, leprose, with granular (but not L. neglecta type), partly membranous appearance; whitish grey to greenish or bluish grey; usually thin (up to 250 µm); shape irregular or forming rosettes, that later fuse with each other, rosettes 0.5-1 cm in diam., irregular patches to 10 cm; margin usually delimited, lobes often present and well defined, 1-2 mm wide, slightly to distinctly raised at margins; cortex absent; medulla present, distinct, white; hypothallus absent; areoles absent; squamules absent; sometimes only sparse soredia on exposed medulla, soredia sparse to abundant and forming thick layer, fine, 20-75 µm in diam.; projecting hyphae usually present, short, up to 20 µm, rarely long, to 100 µm; consoredia common, up to 350 µm in diam.; isidia-like structures absent. Photobiont chlorococcoid, cells 7-12 µm in diam.
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Chemistry
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The main diagnostic substances are atranorin, zeorin and a fatty acid – either rangiformic/jackinic or roccellic/angardianic acid; rarely zeorin is present only in minor amount or very rarely it is absent. Accessories that are not constantly present include norrangiformic acid (minor), an unknown dibenzofuran (minor), 3,7-di-O-methylstrepsilin (trace), pallidic acid (minor), conpallidic acid (minor), ursolic acid (minor), fragilin (trace), 7-chloroemodin (trace) and 3'-demethylatranorin (trace). K+ yellow, C–, Pd+ pale yellow.
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Remarks
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L. pallida also produces atranorin, zeorin and fatty acids and has lobes. L. pallida has more membranous and rough appearance, well developed ±dark hypothallus and thin medulla, contains unidentified fatty acids, L. lobata has slightly thicker thallus with thicker medulla, is more green in colour and has finer individual soredia and larger consoredia, produces roccellic or rangiformic acid and sometimes small amounts of anthraquinones and unknown dibenzofuranes. However, the characters of these species seem relatively similar.
L. jackii is chemically and morphologically somewhat similar to L. lobata. However, L. jackii has much thinner thallus, is more loosely packed and usually unstratified, lacks lobes and only rarely contains zeorin. For other species containing atranorin and fatty acids, see discussion under L. jackii. Several species can develop well developed lobes, see the discussion under L. membranacea.
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Ecology and distribution
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Substrate and ecology: bark, mosses on rock, soil; sheltered places. Distribution: Australia.
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