 |
| Danxiaorchis mangdangshanensis Q. S. Huang, Miao Zhang, B. Hua Chen & Wang Wu, in Zhang, Zhang, Ge & Chen, 2022. |
Abstract
Danxiaorchis mangdangshanensis, a new mycoheterotrophic species from Fujian Province, China, is described and illustrated. The new species is morphologically similar to D. singchiana, but its callus of labellum is a less distinctive Y-shape with three auricles on the apex, four pollinia that are narrowly elliptic in shape and equal in size, and it lacks fine roots. The plastome of D. mangdangshanensis is highly degraded. Phylogenetic analyses distinguished D. mangdangshanensis from its congeners, D. singchiana and D. yangii, with strong support based on nrITS + matK and plastomes, respectively.
Keywords: Chloroplast genome, Epidendroideae, morphology, phylogeny, taxonomy
 |
| Danxiaorchis mangdangshanensis Q. S. Huang, Miao Zhang, B. Hua Chen & Wang Wu, sp. nov. A flowering plant B flower, front view C dissection of a flower, showing dorsal sepal, petal, lateral sepal D gynostemium and labellum, front view E gynostemium and labellum, side view F labellum G gynostemium H anther cap I pollinarium J immature capsule K mature seeds. Scale bars: 1.0 cm (A, B, C, J); 0.5 cm (D–F); 0.2 cm (G); 1.0 mm (H, I, K). |
 |
Danxiaorchis mangdangshanensis Q. S. Huang, Miao Zhang, B. Hua Chen & Wang Wu, sp. nov. A flowering and habitat (photographed by Wang Wu) B front view of a flower C-a dorsal sepal C-b lateral sepals C-c petals C-d labellum D gynostemium and labellum, front view, showing three purple-red spots (white arrows) on the Y-shaped callus (red arrows) E gynostemium and labellum, side view, showing three auricles(red arrows) F labellum, showing remarkable striped appendage G gynostemium, showing narrow wings on the both sides (red arrows) H cross section of labellum, showing indistinct Y-shaped callus (red arrows) I anther cap J pollinarium, front view, showing pollinia 4 in 2 pairs . Scale bars: 5 mm (B); 1 cm (C); 4 mm (D); 5 mm (E); 4 mm (F); 1 mm (G); 4 mm (H); 500 μm (I, J). |
Danxiaorchis mangdangshanensis Q. S. Huang, Miao Zhang, B. Hua Chen & Wang Wu, sp. nov.
Diagnosis: Danxiaorchis mangdangshanensis can be easily distinguished from D. singchiana by having no fine roots, fewer flowers in the raceme, the side lobes of the labellum are ivory-white rather than yellow, and it has only 3 colored strips rather than 4–5 pairs. Additionally, its callus is a less distinctive Y-shape and has three auricles, with a purple-red spot on each auricle at the front, and the callus has a remarkable striped appendage adaxially. Furthermore, there are narrow wings on the side of column, and the four pollinia are narrowly elliptic in shape and equal in size.
Etymology: The Mang dang shan dang xia lang (茫荡山丹霞兰).The epithet mangdangshanensis (茫荡山) refers to Mangdangshan Mountain, Mangdangshan National Nature Reserve, Fujian Province where this new species was found.
Miao Zhang, Xiao-Hui Zhang, Chang-Li Ge and Bing-Hua Chen. 2022. Danxiaorchis mangdangshanensis (Orchidaceae, Epidendroideae), A New Species from central Fujian Province based on Morphological and Genomic Data. PhytoKeys. 212: 37-55. DOI: 10.3897/phytokeys.212.91534
