A giant floating fern that carpets waterways with thick, leafy mats has become a major problem in Alabama waterways. It’s called Giant Salvinia. “Nobody wants it,” said Monica Allen, a spokesperson ...

Homo sapiens is apparently not the only species to have single-handedly changed Earth’s climate. That dubious distinction is shared with Azolla, a diminutive floating fern sometimes called water ...

"The second printing of this book has permitted a few emendations in the keys and correction of some typographical errors, incorrect references, and incorrect names, notably Polystichum lachenense for ...

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