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Dry Bubble (Verticillium)
The cause of dry bubble disease, the most common fungal disease of the white button mushroom (Agaricus bisporus), costing growers an estimated 2-4% of revenue. It does not attack the vegetative mycelium but infects primordia, producing dry, leathery, undifferentiated masses ("bubbles"), split and swollen stems (stipe blow-out) or brown cap spots, depending on when infection occurs. It was long known as Verticillium fungicola and then Lecanicillium fungicola.
Not edible. Diseased mushrooms are unmarketable.
Never eat a wild mushroom based on a web page — confirm with an expert.
Mycology is an evolving science: names, classifications and safety information change as research advances. Entries are compiled from cited sources and reviewed, but may be incomplete or out of date — check the sources, and never rely on this library alone to identify or eat a mushroom.
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