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We might do well to note the decreasing lichen though ...
Excellent book by Frances Anderson (formerly with the NS library) on
NS lichen with many excellent photos. She spent years researching
it, lichen hunting all over the province.
When I first moved here in '69, I was struck bu how much lichen there
was in the woods, more than any place I'd been before except the more
remote parts of the White Mountains in New Hampshire, an area that has
been protected from destructive forces for many years, some of which
is still virgin forest because it was too inaccessible to the vast
and exploitive logging of 100 to 140 years ago.
Mike Spencer Nova Scotia, Canada