Lichen: a simple slow-growing plant that typically forms a low crustlike, leaflike, or branching growth on rocks, walls, and trees; composite organism

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Keywords: apothecium, ascomata, ascus, candle, clavus, crustose, foliose, grain-spored, granite, grey, lake, lichen, lichenometry, photobiont, quail, sarcogyne, utah, yellow