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(family Ophioglossaceae)

A genus of eusporangiate ferns with both the sterile and fertile blades of the leaf pinnately lobed or divided, the massive sporangia subsessile on the fertile pinnae, opening by a transverse slit without a true annulus. There are 23 species, cosmopolitan in distribution, but most are northern temperate.

Subjects: Plant Sciences and Forestry.

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