In the industrialized Saint Lawrence Valley, Quebec, the climax vegetation is rather well preserved on the Monteregian Hills, a series of eight small mountains east of Montreal. The bryological flora of one of these monadnocks, Mount Yamaska, has been intensively studied. Typical bryophytes from several habitats were investigated. Growth forms and their biological spectrum on two substrata were analyzed. Finally the author has catalogued over 220 bryophyte taxa for this small (sq. miles) area.
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