NEW ZEALAND’S SILVER FERN (Cyathea dealbata) showing the SPORES on the silver side of the frond
Ferns do not produce seeds, but instead bear SPORES on the underside of their fertile FRONDS.
SPORANGIA are clusters of SPORES found on the underside of a SPOROPHYLL.
SPORES are the asexual reproductive cells on ferns.
Fern spores are contained in SPORANGIA, which are borne on the leaf surface in clusters called SORI.
SORI come in all shapes, sizes and locations. Here on the Silver fern they appear as small brown dots.

Another view from yesterday's photos of the SPORES under another silver fern:




Another photo I took yesterday of the ferns and native trees on the cliff, overlooking the local beaches: