Asia-Temperate: Taiwan (Taiwan present), Asia-Tropical: Malaya present; Sumatera (Sumatera present); Thailand (Thailand present), N.E. India present, Ryukyu Islands present, S. China present, S. Japan present
S. Japan, Ryukyu Islands, Taiwan, S. China to N.E. India, Thailand; in Malesia: Malaya, Sumatra.
Iwatsuki discussed the variability of this species under T. angulariloba. I have not seen Ching's type of this, but at Kew are two specimens from Hong Kong cited by him; these and others from Hong Kong and Kwangtung show much variability in abundance of long septate hairs on lower surface, though these hairs are always less abundant than in the type of D. in- dochinensis. Ching stated that the type of T. angulariloba lacked glands, but some Hong Kong specimens (including one cited by Ching) have a few. Sumatran specimens are varied both in presence of glands and of septate hairs on lower surface.