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Pellaea atropurpurea, commonly known as purple-stem cliffbrake or just purple cliffbrake, is a fern native to North and Central America.
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Pellaea atropurpurea, commonly known as purple-stem cliffbrake or just purple cliffbrake, is a fern native to North and Central America. Brake is an old word for fern, related to the word bracken. Like many other members of the Pteridaceae, it is a rock plant, needing a calcareous substrate.
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This fern produces clumps of widely arching fronds. The stipe and rachis of the blade are purple, while the blade itself has a blue-gray tinge to it. The upper pinnae are long, narrow, and undivided, while the lower ones are divided into 3–15 pinnules. The pinnae are, for the most part, opposite. Fertile fronds are longer and more heavily divided. They produce sori, which lack a true indusium, within the inrolled margins of the pinnae. This plant may be distinguished from the similar Pellaea glabella by its larger form and by the presence of hairs on the leaf axis (the main leaf stem) and on the underside of the leaflet midribs, which are absent in Pellaea glabella (as reflected in its common name smooth cliffbrake).
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Kanada (Ontario)
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Kanada (Manitoba), Vereinigte Staaten (Vermont-US)
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Belege
Allosorus atropurpureus (L.) Kunze, Allosorus atropurpureus (L.) Kunze ex C.Presl, Allosorus atropurpureus Kuntze, Asplenium atropurpureum (L.) Bernh., Cassebeera atropurpurea (L.) Kaulf.
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Pellaea atropurpurea grows in the crevices of dry limestone cliffs, rocky slopes, crevices in alvars, and mortared walls. It is endangered in Florida, Iowa, and Rhode Island. It has become extinct in Louisiana since the limestone caprock of a salt dome at Winfield, the only location for the fern in the state, was quarried away.
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