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Professor of Mycology
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1600 Holloway Avenue Cesar Chavez Student Center M-100D
San Francisco, California,94132
San Francisco State University, with a student population of over 29,000 students, is one of the 23 campuses that make up the California State University system, the largest system of higher education in the country. SFSU's mission is to create and maintain an... more.
Mycological Society of San Francisco
Our Scientific Advisor is Dr. Dennis Desjardin, Professor of Mycology at San Francisco State University and the curator of the Thiers Herbarium.
By Dennis E. Desjardin, Michael G. Wood, and Frederick A. Stevens
Dennis Desjardin is Professor of Biology at San Francisco State University, where he received his master's degree under the supervision of the late Harry Thiers, to whom the book is dedicated. Upon Harry's retirement, Dennis was hired as his successor and has carried on the Thiers tradition of research on fungus systematics and award-winning teaching. Mike Wood and Fred Stevens are long-time members of the Mycological Society of San Francisco who also were influenced heavily by Thiers and have played important roles in the annual field course held at the University's Sierra Nevada Field Campus, both during the Thiers years and later during the courses taught by Desjardin. Wood and Stevens provided the bulk of the photos, with Desjardin and 21 other photographers contributing additional images.
CMS Meeting Tuesday, November 24: California Mushrooms with Dennis E. Desjardin
Dennis E. Desjardin, Professor of Mycology at San Francisco State University and Director of the Harry D. Thiers Herbarium will speak to us about his Read More
Sonoma County Mycological Association | SOMA Camp Schedule Dennis Desjardin Dennis Desjardin is Professor of Biology at San Francisco State University. He received a Master's Degree from San Francisco State University studying with Dr. Harry D. Thiers, and a PhD from the University of Tennessee under the guidance of Dr. Ronald H. Petersen. He also had the privilege of being trained by Drs.
Blueswami - Spongiforma squarepantsii - Spongiforma squarepantsii
Its discovery in the forests of Borneo, says San Francisco State University researcher Dennis Desjardin, suggests that even some of the most charismatic characters in the fungal kingdom are yet to be identified.
Shaped like a sea sponge, S. squarepantsii was found in 2010 in the Lambir Hills in Sarawak, Malaysia. It is bright orange-although it can turn purple when sprinkled with a strong chemical base-and smells "vaguely fruity or strongly musty," according to Desjardin and colleagues' description published in the journal Mycologia. "We expect that it has a wider range than these two areas," said Desjardin, a professor in ecology and evolution in the SFSU Biology Department. "But perhaps we haven't seen it in more places because we haven't collected it yet in some of the underexplored forests of the region." Desjardin said Spongiforma are related to a group of mushrooms that includes the tasty porcini. But the genus sports an unusual look that is far from the expected cap and stem style. "It's just like a sponge with these big hollow holes," he explained. "When it's wet and moist and fresh, you can wring water out of it and it will spring back to its original size. Most mushrooms don't do that." Spongiforma's ancestors had a cap and stem, but these characters have been lost over time -- a common occurrence in fungi, Desjardin noted. The cap and stem design is an elegant evolutionary solution to a fungal problem. The stem lifts the fungus' reproductive spores off the ground so that they can be dispersed more easily by wind and passing animals, while the cap protects the spores from drying out in their lofty but exposed position. In its humid home, Spongiforma has taken a different approach to keeping its spores wet. "It's become gelatinous or rubbery," Desjardin said. Spongiforma squarepantsii spores -- photos by Dennis Desjardin "Most of these are very cryptic, molds and little things, most of them are not mushrooms," Desjardin said. But even mushrooms-which are sort of like the big game of the fungal world-are mostly unknown. "We go to underexplored forests around the world, and we spend months at a time collecting all the mushrooms and focusing on various groups," Desjardin said. "And when we do that type of work, on average, anywhere from 25 percent to 30 percent of the species are new to science." Desjardin and his colleague Don Hemmes of the University of Hawaii at Hilo will describe five new white-spored species of mushrooms from the native mountain forests of Hawaii in an upcoming issue of Mycologia. Desjardin and his colleagues are racing to discover and study the islands' fungi before native forests succumb to agriculture and grazing. "We don't know what's there, and that keeps us from truly understanding how these habitats function," Desjardin said.