Prothallus

prothallus (noun, pl. prothalli) – a primal thallus persistent as black rim or outline along the periphery of crustose thalli; composed of radiating, branched hyphae or hyphal bundles; forming a white, reddish or blue-black weft devoid of photobiont cells, sometimes projecting far beyond the thallus across the substrate; if extending between the areoles or thallus lobes better referred to as hypothallus.

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