Is Microsorum pteropus 'Narrow' toxic to cats?

Mildly. The ASPCA lists microsorum pteropus 'narrow' as mildly toxic to cats — a chewing cat typically gets mouth irritation, drooling, and vomiting rather than a medical emergency, but it is still best kept out of reach. Microsorum pteropus is not individually listed by the ASPCA. As a true fern (Polypodiaceae) it falls within a group most of which the ASPCA lists as non-toxic, so significant poisoning is unlikely; but because the species is not specifically listed, treat with caution and verify with a vet. Large amounts may cause mild stomach upset.

Microsorum pteropus is not individually listed by the ASPCA. As a true fern (Polypodiaceae) it falls within a group most of which the ASPCA lists as non-toxic, so significant poisoning is unlikely; but because the species is not specifically listed, treat with caution and verify with a vet. Large amounts may cause mild stomach upset. Signs usually appear soon after chewing rather than hours later — watch for drooling, pawing at the mouth, vomiting, loss of appetite, or unusual lethargy after your cat has had access to microsorum pteropus 'narrow'.

Stay calm. Remove any plant from your cat's mouth and take the plant away. Note how much was eaten and when, and do not induce vomiting unless told to. Call your vet or the ASPCA Animal Poison Control Center on (888) 426-4435 and follow their advice; a leaf or photo helps the vet treat it correctly.

The ASPCA classification Growli uses applies to both cats and dogs: Microsorum pteropus 'Narrow' is mildly toxic to dogs as well. See the full microsorum pteropus 'narrow' pet-safety guide for both species.

For a similar look without the risk, see the best cats-safe plants list — every plant there is ASPCA non-toxic to cats and dogs.