Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Woodsia obtusa is a common rock fern of Appalachia and eastern North America. It prefers a calcareous substrate, but also grows in neutral soils. It may grow on rock faces or in scree. This fern is often confused with various ferns of the genus Cystopteris but can be distinguished by its hairy nature. Cystopteris is a genus of ferns. These are known generally as bladderferns or fragile ferns. They are found in temperate areas worldwide.

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