heteromerous thallus

lichen

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In lichen
…of fungal cells, while the heteromerous thallus has a predominance of fungal cells.
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In fungus: Form and function of lichens
…common type of thallus, a heteromerous thallus, has four distinct layers, three of which are formed by the fungus and one by the alga. The fungal layers are called upper cortex, medulla, and lower cortex. The upper cortex consists of either a few layers of tightly packed cells or hyphae…
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