On the basis of internal structure of thallus, the lichens are divided into two groups, namely, homoiomerous and heteromerous lichens. 1. Structure of Homoiomerous Lichen Thallus: In the gelatinous lichen thalli such as Collema and Leptogium, the thallus shows a simple structure with little differentiation. It consists of a loosely interwoven mass of fungal hyphae […]
Structure of Lichen Thallus (With Diagram)
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