RM
Sori on leaves of male fern, Dryopteris
Close-up of the underside of a leaf of the \male fern\", Dryopteris filix-mas, showing the spore- bearing structures known as sori. The spores are contained within the small, black sporangia (spore sacs) which protrude from under the brown, kidney- shaped protective membranes. Some of the sori are coated with a pale grey fungus."
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