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'SpongeBob' Mushroom Discovered in the Forests of Borneo

Sing it with us: What lives in the rainforest, under a tree? Spongiforma squarepantsii, a new species of mushroom almost as strange as its cartoon namesake.

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.

Under a scanning electron microscope, the spore-producing area of the fungus looks like a seafloor carpeted in tube sponges, which further convinced the researchers to name their find after the famous Bob.

The new species is only one of two species in the Spongiforma genus. The other species is found in central Thailand, and differs in color and odor. But close examination of the fungi and genetic analysis revealed that the two were relatives living thousands of miles apart.

"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.
 
 

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