Curled-up sadleria fern
This is an 'ama'uma'u fern, or sadleria fern (sadleria cyatheoides), curled up and not yet deployed as a full-fleged fern. As seen along the Kaupo Trail in Haleakala NP.
This image is from the presentation "A Hawaiian Kaleidoscope - The Flora and Fauna of our Trip".

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