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Re: Giant horsetail tree from Permian of Germany (free pdf)

 It is 15 m high and over 25 cm in diameter

A log of similar diameter, assigned (in the 19th century) to *Calamites gigas*, stands around in a hallway I pass every day here in the Museum für Naturkunde. (Paleobotany storage, not exhibition.) I'll measure it tomorrow. :-)