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The leaflets of the <i>Adiantum cuneatum</i> fern are numerous and wedge shaped at the base. There are three to five sori on each segment.

Adiantum Cuneatum

The leaflets of the Adiantum cuneatum fern are numerous and wedge shaped at the base. There are three…

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.

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

Pinnule of Asplenium

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

"Frond of fern bearing sporangia in sori."&mdash;Finley, 1917

Fern frond

"Frond of fern bearing sporangia in sori."—Finley, 1917

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

Pinnule of Polypodium

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

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

Pinnule of Pteris

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