A new preprint reveals the Californian death cap reproduces by fertilizing itself rather than waiting for a mate—an unusual sort of sexual reproduction in mushrooms that’s rarely been observed outside the lab.
True to its name, the death cap is one of the world’s most lethal mushrooms. Each year in the United States, it kills one or two people and sickens many more, mostly those who mistake it for something edible. Its numbers also seem to be increasing; over the past few decades, the species has swept across North America, becoming particularly widespread along the West Coast, and it shows little sign of stopping.
The research doesn’t prove the fungus’ uncommon sex life is behind its spread, but some scientists say the team’s evidence is intriguing. The study “is very neat and well carried out,” says Sheng Sun, a microbiologist at Duke University Medical Center who was not involved in the work. But death caps in California, where the mushrooms popped up for the first time in the early 20th century, seem to be doing something rather different. DNA from these mushrooms contained just one set of genetic material,, the team reports this week on the preprint server bioRxiv.A. phalloides
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