Structure of Lichen Thallus (With Diagram)
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 with algal cells equally distributed [...]