Identify the incorrect pair regarding the classification of Pteridophytes:
Sphenopsida - Adiantum
Pteropsida - Dryopteris
Psilopsida - Psilotum
Lycopsida - Selaginella
According to the textbook, Pteridophytes are classified into four classes:
Therefore, Adiantum belongs to Pteropsida, not Sphenopsida .
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