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In some classification systems placed in family Polypodiaceae
Answer for the clue "In some classification systems placed in family Polypodiaceae ", 11 letters:
acrostichum
Word definitions for acrostichum in dictionaries
Wikipedia
Word definitions in Wikipedia
Acrostichum is a fern genus in the Ceratopteridoideae subfamily of the Pteridaceae . It was one of the original pteridophyte genera delineated by Linnaeus . It was originally drawn very broadly, including all ferns that had sori apparently "acrostichoid", ...
Usage examples of acrostichum.
A plant that was adapted to living in shallow saltwater environments, it may have grown to a height of twenty feet (based upon a type of mangrove fern, Acrostichum, that exists today).