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Brown Plaster Mold
The brown plaster mold of mushroom compost and casing. It appears as white mycelium on exposed compost, casing or bag sides where condensation forms, then spreads into dense patches that turn tan, cinnamon and finally rust-brown, granular like sand and powdery like talc. Mushroom mycelium does not grow where it is. It is a sign of poorly prepared, over-wet compost.
Not edible; a crop competitor. No toxicity documented.
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 Entries are compiled from cited sources and reviewed, but may be incomplete or out of date — check the sources, and never rely on this library alone to identify or eat a mushroom.
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