This is the Taiwanese variety of Oriental chain fern, collected in the mountainous forests of Taiwan by Dan Hinkley in 1999. The common name is derived from the chain-like arrangment of sori (spore-producing organs) on the underside of the leaves (not seen here).

As I find this plant both structural and photogenic, I've taken a number of photographs of it in the past. Other attempts can be seen here: Woodwardia orientalis var. formosana via the UBC Botanical Garden Forums.

A few notes of interest regarding Botany Photo of the Day:

• A warm welcome to readers of GardenWise. Starting with the Fall 2005 magazine, GardenWise will be highlighting an entry or two from Botany Photo of the Day in each issue, helping us promote both the science and beauty of plants.
• Richard Dickey of Feral Flowers sent a note of thank you regarding the entry on Eschscholzia californica, so I've posted it as a comment - worth checking out.
• Tangled Bank, Issue Number 35 is out, hosted by Cognitive Daily. Tangled Bank is a “blog carnival” - a periodic collection of links to different weblogs based on a certain theme. In the case of Tangled Bank, the theme is science, so follow the link and see some of the best of what other science-themed webloggers are writing about.

Photography resource link: Converting Images from Colour to Greyscale. Darwin Wiggett explores some techniques in Photoshop for converting colour images to greyscale. I've used the “Blending Two Channels” technique for today's photograph, with a red-red channel multiplication at 100%.