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Image Title: Rim of secondary wall material deposited around the margin of the end wall delimiting the future perforation.
Image Credit: Katherine Esau, Jennifer Thorsch
Intended End User: Teacher, Student
License Details: BSA - Terms for Image Use
Copyright held by: Katherine Esau and Jennifer Thorsch, BSA
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About the Image

Rim of secondary wall material (top) has been deposited around the margin of the end wall delimiting the future perforation. Part of the end wall not covered by the rim (bottom) has been removed.

National Science Foundation  Development Supported by the National Science Foundation