PATRICK J. LYNCH / SCIENCE PHOTO LIBRARY PATRICK J. LYNCH / SCIENCE PHOTO LIBRARY
Light micrograph of a section of the brown algae species Fucus vesiculosis, a seaweed known by the common name Bladderwrack; showing male conceptacles (cavaties containing reproductive organs). This species was the original source of iodine, discovered in 1811, and was used extensively to treat goiter. Magnification: 40 x at 35mm.
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