Macula

macula (pl. maculae) - a small pale spot or blotch on the upper or outer surface of a thallus, often due to uneven distribution of photobiont cells below the thalline cortex (or unevenly thickened cortex), representing a locally discoloured or alga-less area, not associated with any break in the cortex; usually whitish or pale; usually visible only with a lens

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Other Resources: Flora Australia Fungi, Lichens  •  Glossary at Mushroom  •  Cornell Pl. Path.  •  APS Pl. Path.: A-D E-H I-M N-R S-V W-Z.
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