These are also called scouring rushes. There are two versions of the same plant: this and a green feathery version. I think, but do not know, that the green version was the scouring rush. We found this huge area of horsetail at the Crystal Lake outlet at the railroad tracks. The soil is very sandy, which horsetail likes.
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The pale phallic stems are the spore-bearing ones, and the green branching ones are sterile and photosynthetic. Both are borne from the same plant, which can spread underground for great distances, both vertically and horizontally.
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