An alternative idea is that the greater diversity of amphibian species in virgin forest helps the fungus to spread.

BBC: Double whammy for the disappearing frogs

In 2001 he brought back twigs of an ulmo tree from Chile's Patagonian rain forest on which lived the fungus Gliocladium roseum.

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Soon he was digging up the forest, looking for edible fungus.

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Among research efforts on the fungus is one by Lopez and Longo, who have been catching frogs in the forest, checking them for Bd and ticks, and then releasing them back into the night.

NPR: Alarm Over Vanishing Frogs In The Caribbean