Horsetail spores. Coloured scanning electron micrograph (SEM) of spores of a horsetail (Equisetum sp.). The spores (orange) bear elaters (green), which expand and contract with changes in humidity. Elaters help to tangle spores together into a clump called a propagule, and to dig spores into the soil. Horsetails are the only living group of a primitive family of plants, the Sphenopsids, that date back to the Devonian period, 355-410 million years ago. Horsetails normally spread by asexual reproduction using rhizomes (underground stems). Magnification: x180 at 6x7cm size.
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Creative#:
TOP10168071
Source:
達志影像
Authorization Type:
RM
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須由TPG 完整授權
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No
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