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Each species will usually grow best on only one kind of substrate, that is, a lichen
which grows on trees normally will almost never be found on rocks, although
some very common species such as Parmelia rudecta and Par- melina aurulenta
There is tremendous variation in thallus size and lobe width, but basically all
species have more or less branched lobes, a distinct white (rarely pigmented)
medulla, and a thin green (rarely blue-green) algal layer just below the upper
Mason E. Hale. striate longitudinally; apothecia numerous, the spores ellipsoid.
Cortex and medulla K— , P— (usnic acid only). Common on tree trunks in open
areas. This species is common in the scrub forests of central and southern Texas.
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LibraryThing ReviewUser Review - 2wonderY - LibraryThing
Disappointing. Instead of presenting the various species in a fashion that promotes the different growth styles, they are listed alphabetically. The pictures are not only black & white, some of them ... Read full review