Scientists find world's oldest fossil mushroom

June 7, 2017, University of Illinois at Urbana-Champaign
The mushroom was uncovered in the Araripe Basin, in northeast Brazil, in a limestone layer called the Crato Formation. Credit: Danielle Ruffatto

Roughly 115 million years ago, when the ancient supercontinent Gondwana was breaking apart, a mushroom fell into a river and began an improbable journey. Its ultimate fate as a mineralized fossil preserved in limestone in northeast Brazil makes it a scientific wonder, scientists report in the journal PLOS ONE.

The mushroom somehow made its way into a highly saline lagoon, sank through the stratified layers of salty water and was covered in layer upon layer of fine sediments. In time - lots of it - the mushroom was mineralized, its tissues replaced by pyrite (fool's gold), which later transformed into the mineral goethite, the researchers report.

"Most grow and are gone within a few days," said Illinois Natural History Survey paleontologist Sam Heads, who discovered the mushroom when digitizing a collection of fossils from the Crato Formation of Brazil. "The fact that this mushroom was preserved at all is just astonishing.

"When you think about it, the chances of this thing being here - the hurdles it had to overcome to get from where it was growing into the lagoon, be mineralized and preserved for 115 million years - have to be minuscule," he said.

Before this discovery, the oldest fossil mushrooms found had been preserved in amber, said INHS mycologist Andrew Miller, a co-author of the new report. The next oldest mushroom fossils, found in amber in Southeast Asia, date to about 99 million years ago, he said.

The world's oldest fossil mushroom was preserved in limestone, an extraordinarily rare event, researchers say. Credit: Jared Thomas/Drawing by Danielle Ruffatto

"They were enveloped by a sticky tree resin and preserved as the resin fossilized, forming amber," Heads said. "This is a much more likely scenario for the preservation of a mushroom, since resin falling from a tree directly onto the forest floor could readily preserve specimens. This certainly seems to have been the case, given the mushroom fossil record to date."

The mushroom was about 5 centimeters (2 inches) tall. Electron microscopy revealed that it had gills under its cap, rather than pores or teeth, structures that release spores and that can aid in identifying species.

"Fungi evolved before and are responsible for the transition of plants from an aquatic to a terrestrial environment," Miller said. "Associations formed between the fungal hyphae and plant roots. The fungi shuttled water and nutrients to the plants, which enabled land plants to adapt to a dry, nutrient-poor soil, and the fed sugars to the fungi through photosynthesis. This association still exists today."

The researchers place the mushroom in the Agaricales order and have named it Gondwanagaricites magnificus.

The mushroom lived during the Early Cretaceous, a time of dinosaurs when the ancient supercontinent Gondwana was breaking apart. Credit: Danielle Ruffatto

Explore further: Intact mushroom and mycophagous rove beetle in Burmese amber leak early evolution of mushrooms

More information: "The oldest fossil mushroom" PLOS ONE (2017).

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