Assertion: extant fern | /r/HasProperty | leptosporangiate
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text: Indeed, most of the major groups of extant ferns (leptosporangiates, marattoids, sphenophytes, and ophioglossoids/whisk ferns) apparently diverged from each other during the next 10-20 million years (i.e., during late Middle Devonian and Late Devonian).