史前灭绝植物莱式蕨的模拟图

Jeff Benca is an admitted über-geek when it comes to prehistoric¹ plants, so it was no surprise that, when he submitted a paper describing a new species of long-extinct lycopod（石松植物） for publication, he ditched the standard line drawing and insisted on a detailed² and beautifully rendered color reconstruction³ of the plant. This piece earned the cover of March's centennial（百年纪念） issue of the American Journal of Botany（植物学）. Benca described this 400-million-year-old fossil lycopod, Leclercqia scolopendra, and created a life-like computer rendering⁴. The stem of the lycopod is about 2.5 millimeters across.   "Typically, when you see pictures of early land plants, they're not that sexy: there is a green forking stick and that's about it. We don't have many thorough reconstructions⁵," said Benca, a graduate student in the Department of Integrative Biology and Museum of Paleontology at UC Berkeley. "I wanted to give an impression of what they may have really looked like. There are great color reconstructions of dinosaurs⁶, so why not a plant?"   Benca's realistic, full-color image could be a life portrait, except for the fact that it was drawn⁷ from a plant that lay flattened⁸ and compressed into rock for more than 375 million years.   Called Leclercqia scolopendra, or centipede clubmoss, the plant lived during the "age of fishes," the Devonian Period. At that time, lycopods -- the group Leclercqia belonged to -- were one of few plant lineages with leaves. Leclercqia shoots were about a quarter-inch in diameter and probably formed prickly, scrambling⁹, ground-covering mats. The function of Leclercqia's hook-like leaf tips is unclear, Benca said, but they may have been used to clamber over larger plants. Today, lycopods are represented by a group of inconspicuous plants called club mosses¹⁰, quillworts and spikemosses.   Both living and extinct lycopods have fascinated Benca since high school. When he came to UC Berkeley last year from the University of Washington, he brought a truckload of some 70 different species, now part of collections at the UC Botanical Garden.   Now working in the paleobotany lab of Cindy Looy, Berkeley assistant professor of integrative biology, Benca continues to establish a growing list of living lycopod species, several of which will eventually be incorporated into the UC and Jepson Herbaria collections.