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I found some specimens in my collection with what looks like a white fungus. Does anyone recognise this and know the best course of action?
Thanks so much

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At some point (or perhaps still) the specimens were stored under too humid conditions. Keeping the dry enough will prevent spread. You might try to remove it using a fine brush or tip of a pin but if it is not spreading and still 'open' as on the picture, you might consider just leaving it there.