Isidium
isidium (pl. isidia) – a small (mostly 0.5-1 mm) outgrowth of the thallus with a cortex, containing both mycobiont and photobiont (organized as in the thallus), serving as an asexual (somatic) dispersal unit (propagule); often granular, warty, pin- or finger-shaped, club-shaped, less often compressed and spathulate, squamose (scaly), or even shield-like ("peltate"); either simple or subdivided, sometimes elaborately branched and coralloid. The term isidium is often used rather broadly, to include all corticated propagules , even ones only externally similar, such as dactyls or pseudoisidia (see isidiomorphs and papillae).
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