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Hello, my name is***** and I have over 20 years of experience as a veterinarian. I understand that you are concerned because Meeka was nibbling on your "Frosty Fern" (Selaginella kraussiana).
The good news is that this plant is not listed as a toxic plant by the ASPCA. It is listed as safe for cats, dogs and horses.
Any plant eaten in significant quantities can cause stomach upset simply due to increased amounts of rough material in the stomach and being an unusual food. But this plant does not contain any irritants nor is it organ toxic.
Meeka should be just fine.
Please let me know if you have any further questions.