Update name of Amblovenatum J.P.Roux genus (Thelypteridaceae) and received new distribution of Amblovetatum terminans in Vietnam

The genus Amblovenatum J.P. Roux is a small genus in the Thelypteridaceae. Previously, the genus Amblovenatum was named Amphineuron (Holttum, 1971). In 2007, David Middleton argued for the homonyms between the genus Ampineuron (Thelypteridaceae) and the genus Amphineurion (Apocynaceae). By 2009, the name Amblovenatum was used by J.P. Roux to replace the name Amphineuron. The genus Amblovenatum J.P. Roux has outstanding features in fronds, laminae, pinnae, lobes, segments, veinlets, sori, indusia, sporangia. Species of the genus Amblovanatum are distributed from East Africa to Polynesia; India to Northeast Australia; the remainder in Malesia and the Pacific, especially in New Guinea, and has been reported to be distributed in Vietnam. The study added information and explanations on the genus name change and updated the new name of the genus Amblovenatum. Description the morphological characteristics of the genus Amblovenatum, distribution, ecological biology, type; species description Amblovenatum terminans (Hook.) J.P. Roux includes scientific name, Vietnamese name, distribution, ecology, type, examined specimens.