Definitions

1. adjective

of or relating to a peridium, especially a cup or saucer of spores surrounding the sporangium of a fern or other plant.

“The peridial structure of the fern is quite impressive.”

2. noun

A peridium, especially a cup or saucer of spores surrounding the sporangium of a fern or other plant.

“The peridial of the fern has a unique shape.”