Asia-Tropical: Borneo present; Malaya present; Sumatera (Sumatera present)
Malesia: Malaya, Sumatra, Borneo.
v.A.v.R. distinguished var. borneensis which has many glands and no hairs on indusia. His M. sumatrensis was based on a rather small specimen. Glands are apparently sometimes lacking on lower surface of costules.