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Published online by Cambridge University Press: 01 May 2009
Dr. Nathorst mentioned to me in 1910 the fact that the rhizomes of Equisetum columnaris had not been observed, and I offered to show him a place where I thought they would be found. He had not time to visit the section on that occasion, but in the following year Dr. T. G. Halle accompanied me to the exposure and agreeably to expectation the rhizomes were found within a few minutes of our arrival.
1 Grand'Eury, C., Flore Carbonifère du Département de la Loire et du centre de la France, Paris, 1877, p. 15, pl. i, fig. 1.Google Scholar