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Squamulose thalli of some
Leptogium
species.
Leprose lichens
: these lichens are reduced to a soft mass of powdery granules which can be easily
removed from the substrate.
Gelatinous lichens
: this group includes both foliose and crustose species. They contain
cyanobacteria and have an undifferentiated thallus (homoiomerous), that becomes highly gelatinous
when wet.
Compound lichens
: some lichens (especially those of the genus
Cladonia
) have 2 types of thallus, a
primary thallus consisting of a mat of basal squamules, and erect fruticose structures (podetia) of
various shapes.
Simple to branched podetia of
Cladonia
