Arthroppitys bistriata

Modern plants of the calamities family are the horsetails of which this specimen is a species. The white in this photograph is the xylem, or true wood, and the pink is the pith or center of the stem which has been filled with quartz colored pink by iron. Because a tube is a structure that resists bending, calamities of relatively narrow diameter could grow into plants that were more than a hundred feet tall.
Copyright © 2003 Giraud Foster & Norman Barker