Sori can be found on the underside of this tiny fern’s fronds. They consist of an assembly of spore-producing sporangia (1) and paraphyses – supportive hairs shaped like a bowling pin, which play a ...

Six are detailed below. One way to identify ferns is by the shape, arrangement and location of their “sori” — small clusters of spore-producing structures found on the undersides of fern leaves, best ...