Atlas Of Ferns Of The British Isles

72 ATHYRIACEAE
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24.1 Cystopteris fragilis (L.) &mill.
A widespread species preferring base-rich rock substrate in the
wetter areas of the country. It is occasionally found in manmade
habitats (shady moist walls) in the south and east . Both
tetraploid and hexaploid (and sterile pentaploid) forms are
recorded in Britain; the frond of the former is less dissected but
no distribution patterns have so far emerged in the relatively
small sample studied.
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