What are bat plants?

It's a Tacca, either T. chantrierei, or T. integrifolia. They need a mixture of 50% leafmould and 50% coarse bark, with slow release fertiliser. They also need a monthly foliar feed with half-strength liquid fertiliser. They are not hardy, so they have to be grown under glass.

Got all this from my RHS book! I hope it's what you needed to know.