Fertile stem of the horsetail

Fertile stem of the horsetail

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Caption: Horsetail. Macrophotograph of a fertile stem of the field horsetail Equisetum arvense. This fertile "cone-like" structure bears white sporangia which contain spores. The spore producing "cone" appears in March in Britain, 10- 25cm tall, ripening until in dry weather the spores are tossed out of the sporangia. Horsetails are the only living members of a primitive group of plants, the Sphenopsids, that predominated during the formation of the coal measures. Equisetum arvense is common throughout Britain in field, wastegrounds and roadside.

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Keywords: botany, equisetum arvense, fertile stem, horsetail, macrophotograph, nature, plant, pteridophyte, pteridophytes

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