Male Fern Sporangia, SEM

Male Fern Sporangia, SEM

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Credit: TED KINSMAN/SCIENCE PHOTO LIBRARY

Caption: SEM image of the sporangia, (spore sacs), of the Male Fern. The sporangia are borne on the undersides of the leaf fronds in brown, kidney-shaped structures known as sori. Each sporangium is a biconvex capsule in which the mature spores lie freely. As the mature sporangium dries, the tension in the walls of the annulus causes the sporangium to rupture, expelling the spores which are then distributed by the wind. The calibration bar is 20 um and the image was collected at a magnification of 2,280x.

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Keywords: botany, buckler fern, buckler ferns, color, dryopteridaceae, dryopteris, enhanced, fern, ferns, flora, male fern, male ferns, nature, plant, plantae, pteridophyte, pteridophytes, reproduction, reproductive, sac, sacs, scanning electron micrograph, scanning electron microscopy, sem, sporangia, sporangium, spore, spore sac, spore sacs, spore-bearing, spores, wood fern, wood ferns

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