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Pellaea atropurpurea
This is a fern, ''P. atropurpurea'', commonly known as purple-stem cliffbrake or just purple cliffbrake. 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.
''P. atropurpurea'' is an apogamous autotriploid, with ''3n=87'' (actual base number, ''n=29''), and is one of the historical parents of the hybrid species complex, ''Pellaea glabella''. Apogamy, or the ability to reproduce non-sexually, is common among rock ferns in the Pteridaceae.
==Characteristics==
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 hairier nature and larger form.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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