CLAUDE NURIDSANY & MARIE PERENNOU / SCIENCE PHOTO LIBRARY CLAUDE NURIDSANY & MARIE PERENNOU / SCIENCE PHOTO LIBRARY
Field horsetail (Equisetum arvense) cone. This is a fertile stem, bearing a structure called the cone or strobilus. The cone releases spores (containing the male reproductive cells), and are part of the sexual reproduction of this plant. Horsetails normally use asexual reproduction using rhizomes (underground stems).
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