Whisk fern Psilotum nudum Location: National Botanical Garden - Washington, DC Year: 2003 Merckslides catalogue number: 05-16588 Comments:

Whisk fern Psilotum nudum Location: Mauna Ulu Trail, Hawaii Volcanoes National Park, Hawai'i, HI Year: 2012 Merckdigitals catalogue number: 05-78085 Comments:

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