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Image Title: Circinate vernation in Thelypteris extensa
Image Credit: Ryan McMillen, Southern Illinois University
Intended End User: Teacher, Student
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About the Image

In most ferns the young leaf uncoils during development; these coiled fronds are commonly referred to as "fiddle heads". This photo shows this type of leaf development, known as circinate vernation in Thelypteris extensa.

National Science Foundation  Development Supported by the National Science Foundation