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Hi Phil, looks like fungus growing inside your eyepiece. Any time you store an eyepiece, binoculars or telescope in a humid, confined space you're risking getting fungal growth on the glass.
To avoid the problem you could store optics on a shelf covered with a cloth in an air conditioned part of the house (or heated part of the house in cooler climates) or you can store eyepieces in a sealed container with dessicant to remove moisture.
I store all my eyepieces in a craftright airtight case from bunnings with a rechargeable dessicant pack.
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