Thallic Mycelial and Cytological Characters in Ascomycete Systematics
The lichen system is primarily based on characteristics of the ascomata and especially of the ascus, while structures of the vegetative thallus are of minor importance. In comparison to other cryptogams, the degree of differentiation in lichen thalli is high while the number of specialized cells and tissues is low. Differentiation is often achieved by multifunctionality and low determination of structures. This variability of characteristics reduces their value for systematic purposes. Successful use of vegetative characteristics depends primarily on their development and not on their mature shape.
KeywordsVascular Plant Vegetative Structure Vegetative Characteristic High Taxon Lichen Thallus
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