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Photobiont trentepohlioid
: the photobiont is a green alga which contains orange pigments, so that
the photobiont layer (visible also by scratching the thallus) has a dirty orange colour.
SPORES
The observation of spores is often essential for the identification of lichens, especially crustose
species. Important are shape, size, color, cell number, and number of spores per ascus. Below is a
brief overview of different types of spores.
Simple spores (1 cell only).
2-celled, colourless spores.
2-celled, brown spores.
2-celled, polar-diblastic spores
: the two cells are connected by a thin canal.
