This photo is of a sorus on the bottom of a fern leaf. A sorus is a cluster of sporongia, these structures produce spores which are dispersed and grow into new plants. Stomata are also visible on the leaf surface.
This is a stack of 82 images, taken with my Nikon D300 using a Nikon M Plan 10/0.25 objective on bellows. The sorus is about 1mm across.
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