Oak Fern sori, Gymnocarpium dryopteris
A stand of Oak Fern, Gymnocarpium dryopteris, whose delicate ternate fronds seem to be in circular motion
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Oak Fern sori, Gymnocarpium dryopteris
Sori of the Oak Fern, Gymnocarpium dryopteris, are produced on the back of the leaflets. Each sorus, composed of 50 or so sporangia, appears to the naked eye like a little brown dot on the back of the leaflet. Gymnocarpium sori lack an indusium.
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Oak Fern spores, Gymnocarpium dryopteris
Spores of the Oak Fern. These spores are about 40 microns long. Less than half the thickness of a hair.