Asia-Tropical: Southeast Asia: present from the Himalayas to Japan: present
Widespread throughout Southeast Asia, from the Himalayas to Japan, throughout Malesia.
The presence of both separate sori and coenosori in this genus has induced Ching to distinguish Lepidogrammitis, and Copeland (1947) to distinguish Weatherbeya. However, taken over the entire range of Lemmaphyllum, the forms with different types of sori can be seen to grade into each other imperceptibly. Lemmaphyllum is closely related to Lepisorus, from which it differs mainly in the filiform, creeping rhizome and the tendency to form coenosori.
Lemmaphyllum, Epim. Bot.: 157. 1851