Fang Wen, Zi-Bing Xin, Long-Fei Fu, Shu Li, Lan-Ying Su,Stephen Maciejewski, Zhang-Jie Huang, Truong Van Do, Yi-Gang Wei
Michaelmoelleria (Gesneriaceae), a new lithophilousdwelling genus and species with zigzag corolla tubefrom southern Vietnam
PhytoKeys 146: 89–107 (2020)
ABSTRACT
Michaelmoelleria, a new genus from southern Vietnam is described with a single species, M. vietnamensis. The new genus is morphologically most similar to Deinostigma and Tribounia but it differs from the latter two by having four fertile stamens. Nuclear ribosomal internal transcribed spacer (ITS) region and plastid trnL-F intron spacer (trnL-F) DNA sequence data from the new genus and eighty-seven species representing 42 genera within tribe Didymocarpeae are used to resolve its generic placement. The molecular evidence reveals that it is most closely related to Cathayanthe rather than Deinostigma and Tribounia. The chromosome number is counted as 2n = 36 that further clarified its distinction comparing to the related genera within tribe Didymocarpeae. A global conservation assessment is also performed and classifies Michaelmoelleria vietnamensis as Critically Endangered (CR).
Original article link: https://phytokeys.pensoft.net/article/49731/
Figure 1. Photos of the new genus, Michaelmoelleria, the population in natural habitat. M. vietnamensis F.Wen, Z.B.Xin & T.V.Do A habitat along the La stream B habit C plants in flower D frontal view of flower in natural habitat E lateral view of flower in natural habitat. Photos by Fang Wen, arranged by Wen-Hua Xu.
Figure 2. The Bayesian Inference 50% majority rule consensus tree from the combined dataset of trnL-trnF and ITS. Numbers on the branches indicate the posterior probability (≥0.5) of Bayesian inferenceanalysis and bootstrap values (≥50%) of the maximum likelihood. BOLDFACE indicates the new species/new genus. Created by Long-Fei Fu.
Figure 3. Somatic chromosomes at metaphase of Michaelmoelleria vietnamensis F. Wen, Z.B. Xin &T.V. Do, 2n = 36 A–C are from different cells, solid arrow and, satellites. Photos and arrangements byLan-Ying Su.
Figure 4. Photos of new genus, Michaelmoelleria F. Wen, Y.G. Wei & T.V. Do. M. vietnamensis F. Wen,Z.B. Xin & T.V. Do A flowering potted plant in GCCC’s greenhouse B frontal view of the corolla andthe corolla tube C different angles of a lateral view of corolla and corolla tube (I) D different anglesof lateral view of the corolla and the corolla tube (II) E cyme F bracts (above: adaxial surface; below:abaxial surface) G calyx lobes H lateral view of flower and bud I calyx lobes (the left three: adaxial calyxlobes surfaces; the right two: abaxial calyx lobes surfaces) J opened corolla showing stamens and staminodeK our fertile anthers L pistil and calyx M stigma. Photos by Fang Wen, arranged by Wen-Hua Xu.
Figure 5. Photos of Cathayanthe biflora Chun, the related genus/species of Michaelmoelleria vietnamensisF. Wen, Z.B. Xin & T.V. Do A habitat B cyme and frontal view of flower C cyme and lateral view offlower D fruit. Photos by Fang Wen, arranged by Wen-Hua Xu.
Figure 6. Photos of Deinostigma W.T.Wang & Z.Y.Li (A–E) and Tribounia D.J.Middleton (F–I), themorphologically similar genera and species of Michaelmoelleria F.Wen, Y.G.Wei & T.V.Do (M. vietnamensis F.Wen, Z.B.Xin & T.V.Do) A Deinostigma eberhardtii (Pellegr.) D.J.Middleton & H.J.Atkins B D. tamiana (B.L.Burtt) D.J.Middleton & H.J.Atkins C D. cycnostyla (B.L.Burtt) D.J.Middleton & H.J.AtkinsD D. cicatricosa (W.T.Wang) D.J.Middleton & Mich.Möller E D. cyrtocarpa (D.Fang & L.Zeng) Mich.Möller & H.J.Atkins F–G Tribounia venosa (Barnett) D.J.Middleton H–I T. grandiflora D.J.Middleton.A–E photos by Fang Wen F–I photos by David Middleton, arranged by Wen-Hua Xu.
