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Image Title: Primary xylem of Phaseolus vulgaris stem, with ring-like and helical secondary walls.
Image Credit: Katherine Esau
Intended End User: Teacher, Student
License Details: BSA - Terms for Image Use
Copyright held by: Katherine Esau, BSA
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About the Image

Primary xylem of Phaseolus vulgaris stem, with ring-like and helical secondary walls (close to bottom of slide). Secondary wall surrounds perforations at the two ends of an individual vessel member. Perforations are formed by localized removal of the primary wall.

National Science Foundation  Development Supported by the National Science Foundation