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An illustration of a pinnule of aspidium showing veins and sori.

Pinnule of Aspidium

An illustration of a pinnule of aspidium showing veins and sori.

The Common Male Fern (Dryopteris filix-mas) is a species of male fern in the Dryopteridaceae family.

Common Male Fern

The Common Male Fern (Dryopteris filix-mas) is a species of male fern in the Dryopteridaceae family.

An illustration of section through a pinnule of the frond and sorus of Aspidium: b, mesophyll; sch, indusium; sp, sporangium; st, its stalk; r, annulus.

Section of a Nephrolepis

An illustration of section through a pinnule of the frond and sorus of Aspidium: b, mesophyll; sch,…