Abstract
In the years since the publication of Ferns of Michigan (Billington, 1952) no part of the fern flora of the state has been the subject of as much intensive study as the genus Botrychium, the Moonworts and Grape Ferns. The fact that all of the Michigan species, even the supposedly rare Moonworts, are locally abundant in suitable habitats has made possible field observation of variation within large populations. The occurrence of many mixed populations, with from two to five species existing together, has permitted the testing of species criteria on living or freshly collected plants from identical habitats rather than on pressed, dried material, a great advantage in a group such as this where the differences between taxa are rather subtle and
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