Ophioglossidae

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Ophioglossidae [‚äf·ē·ō′gläs·ə‚dē]

(botany)

The adder's-tongue ferns, a small subclass of the class Polypodiopsida; the plants are homosporous and eusporangiate and are distinguished by the arrangement of the sporogenous tissue in the characteristic fertile spike of the sporophyte.

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