A new species of Rubiaceae, Psydrax gialaiensis B.H.Quang, T.B.Tran & V.S.Dang, sp. nov., is described and illustrated from the Kon Chu Rang Nature Reserve, Gia Lai Province, southern Vietnam. This species is characterized by having strigose branches and leaves, a conspicuously bulging, short corolla tube, an accrescent nectary disc and a style with a dense tuft of hairs, which clearly distinguishes it from the other species in the genus. A description, vernacular name, conservation assessment, illustration, photographs, and a key to the species of Psydrax in Vietnam are provided.
The new species Dregea taynguyenensis from Vietnam is described, illustrated and compared with the other Dregea species occurring in Vietnam and neighbouring countries D. cuneifolia, D. sinensis, D. volubilis and D. yunnanensis. Dregea taynguyenensis differs from these species by the leaf blade secondary veins number, calyx lobes shape, and corolla lobes size.
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.
Studying Thelypteridaceae in Phia Oac - Phia Den National Park in Cao Bang province, the authors determined that the family Thelypteridaceae includes 8 genera and 12 species. Compared with previous studies, the number of species belonging to the family Thelypteridaceae has increased by 3 species. In addition, the authors have updated the correct nomenclature name of a number of species in the family Thelypteridaceae. Pronephrium is genus with the largest number of species with 4 species (accounting for 33.3%), there is 1 genus with 2 species and 6 genera with 1 species. Within the scope of this paper, the authors have made statistics on the number of species, the number of genera belonging to the family Thelypteridaceae; describe the identification characteristics, where the standard samples were collected (loc. class.), information on the standard specimens of each species (typus), biology and ecology, and distribution of species in the family Thelypteridaceae is distributed in Phia Oac - Phia Den National Park, Cao Bang province.
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