Paragyromitra infula, formerly known as Gyromitra infula, is a bizarre and recently reclassified mushroom that has completely reshaped our understanding of false morels. Once believed to be highly toxic, this species has undergone a taxonomic rebirth, becoming the defining species of a newly established genus.

Modern phylogenomic research revealed that P. infula is not closely related to traditional false morels but is instead a sister lineage to underground truffle-like fungi, explaining its unusual evolutionary history. Its iconic saddle-shaped cap, often compared to a fortune cookie, forms due to structural constraints during growth, forcing the expanding spore surface to fold into sharp lobes.

In a major scientific breakthrough, recent chemical analysis found no detectable gyromitrin, the deadly toxin associated with related species. This overturns over a century of assumptions, though the mushroom is still considered unsafe due to the risk of confusion with toxic lookalikes like Paragyromitra ambigua.

Scientists have even developed a DNA-based field test capable of identifying this species from tiny or degraded samples, offering a powerful tool for foragers and toxicology cases. It may also play a role in the formation of the mysterious natural phenomenon known as hair ice, where fine strands of ice grow from decaying wood due to fungal activity.

Unlike most false morels, P. infula fruits in the autumn, breaking the typical spring pattern and thriving on decaying wood with specialized enzymes that break down lignocellulose.

This episode explores its taxonomic revolution, unusual growth mechanics, surprising chemistry, DNA detection methods, ecological role, and connection to rare natural phenomena—revealing one of the most misunderstood fungi in the world.