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Home > All Images > 1987 > March > 25 Mar 1987

Images Dated 25th March 1987

Choose from 10 pictures in our Images Dated 25th March 1987 collection for your Wall Art or Photo Gift. All professionally made for Quick Shipping.

Spore of field horsetail Featured 25 Mar 1987 Image

Spore of field horsetail

False colour scanning electron micrograph of spores of the field horsetail, Equisetum arvense. The horsetail is the only living type of a primitive family of plants, the Sphenopsids, that were predominant at the formation of the coal measures. The vegetative stems are produced from underground rhizomes & the leaves are reduced to toothed sheaths at the leaf joints. Fertile shoots bear conelike sporangia, carrying the spores, which in this species appear in Spring. The picture shows a moist spore bound tightly by their elators, or bands of thickened cells. As the spores dry out, the elators unfurl, tossing the spores out of the sporangium. Mag: X 320 at 35mm. Original is BW print b450/029