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A fertile shoot of horsetail, Equisetum arvense.

I took a specimen home with me.  This is a close-up of the sporangiophores:

It yielded spherical spores of about 50x50um (magnification x600, field width 86um):

Some seemed to be entangled with some tubular structures:

First photo and specimen taken in Whiteknights Park, Reading, UK, on 2014-04-06.

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