Mushroom gills are the thin, papery structures that hang vertically under the cap. The sole purpose of these gills, called lamellae, is to produce spores. The spores are then dropped from the gills by the millions where they are scattered by wind currents. Excerpt from Mushroom Appreciation.com

Photo taken in the Southern Appalachian Mountains in North Carolina, USA in Macon County near the small town of Franklin.
© Jean Gregory Evans
Canon PowerShot SX20 IS 1/320s 5mm f/2.8 ISO-80

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