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Tuesday, April 6th, 2021
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| 10:13a | [Botany • 2021] Petrocodon albinervius (Gesneriaceae) • A New Species from Limestone Areas in southwestern Guangxi, China
Abstract Petrocodon albinervius D.X. Nong & Y.S. Huang (Gesneriaceae) is described and illustrated as a species new to science occurring in the limestone area of southwestern Guangxi, China. It shows overall most similarity with P. ionophyllus F. Wen, S. Li & B. Pan, P. integrifolius (D. Fang & L. Zeng) A. Weber & Mich. Möller and P. ainsliifolius W.H. Chen & Y.M. Shui in leaf shape, but differs in several characters such as the leaf blade indumentum, leaf veins coloration, the size and shape of bracts, the number of cymes per plant and flowers per cyme, and the shape of the stigma. Besides a diagnosis and detailed description, we also provide ecological information, photographic images, a table and taxonomic notes to distinguish several other morphologically similar Petrocodon species and proposed conservation status for this species. Keyword: limestone flora, new taxon, Petrocodon ainsliifolius, Petrocodon integrifolius, Petrocodon ionophyllus, taxonomy
   Petrocodon albinervius D.X. Nong & Y.S. Huang, sp. nov. 白脈石山苣苔 Diagnosis: Petrocodon albinervius is morphologically similar to P. ionophyllus, P. integrifolius and P. ainsliifolius, but can be easily distinguished from P. integrifolius and P. ainsliifolius by its densely pubescent lamina (vs. densely white strigose lamina), ca. 8 mm long filaments (vs. ca. 3 mm long filaments), undivided stigma (vs. divided stigma). It also can be distinguished from P. ainsliifolius by its elliptic bracts (vs. linear bracts). Petrocodon albinervius most resembles P. ionophyllus in the leaf shape and style, but differs from the latter by its densely pubescent and pale green lamina (vs. sparsely strigose and purplish green to purplish brown lamina), cymes 3–7 per plant and flowers 4–30 per cyme (vs. cymes 1–2 per plant and flowers 3– 5 per cyme), elliptic bracts ( vs. lanceolate bracts), undivided and hippocrepiform stigma (vs. bilobed stigma, with ovate lobes). Etymology: The species epithet “albinervius” refers to the distinctive leaf blade with silvery veins. The Chinese name is proposed here as “白脈石山苣苔”. Phonetics: “Bái Mài Shí Shān JùTái”. Distribution and Ecology: The new species is endemic to Guangxi and known only from the type locality (Fig. 4). It grows on moist and shaded rocky faces of steep rocky slope under evergreen broad-leaved forests at an elevation of 800–850 m. The slope is facing northwest and at an angle of up to 60 degrees. The tree cover is up to 12 m tall, the canopy cover is 75%, the shrub layer cover is 85%, and the herb layer cover is 35%. Associated species include Begonia picturata Yan Liu, S.M. Ku & C.I. Peng (Begoniaceae), Pseudochirita guangxiensis (S.Z. Huang) W.T. Wang var. glauca Y. G. Wei & Yan Liu and Lysionotus oblongifolius W.T. Wang (both Gesneriaceae), Cymbidium lancifolium Hook. (Orchidaceae), Vaccinium dunnianum Sleumer (Vacciniaceae), and Ardisia carnosicaulis C. Chen & D. Fang (Myrsinaceae) amongst others.  Dong-Xin Nong, Bao-You Huang, Shi-Yue Nong and Yu-Song Huang. 2021. Petrocodon albinervius, A New Species of Gesneriaceae from Limestone Areas in southwestern Guangxi, China. Taiwania. 66(2); 135-140. DOI: 10.6165/tai.2021.66.135   | ||||||
| 12:59p | [Botany • 2020] Miconia lucenae (Melastomataceae) • A New Species from Montane Atlantic Forest in Espírito Santo, Brazil
Abstract We describe Miconia lucenae R.Goldenb. & Michelang., a new species from the montane Atlantic Forest in Santa Teresa in the state of Espírito Santo. Our analysis, based on three plastid spacers (atpF-atpH, psbK-psbl and trnS-trnG), one plastid gene (ndhF, not available for M. lucenae), and two nuclear ribosomal loci (nrITS and nrETS), showed that it belongs to a small clade with Miconia paradoxa (Mart. ex DC.) Triana (Minas Gerais) and M. michelangeliana R.Goldenb. & L.Kollmann (Espírito Santo). The three species in the “Paradoxa clade” can be recognized by the plants with glabrous or glabrescent branches and leaves, white petals and yellow stamens, these with the connectives not prolonged below the thecae, ventrally unappendaged, dorsally unappendaged or with a minute tooth, the latter bilobed or not, glabrous ovary, and the fruits with a persistent calyx. Miconia lucenae can be recognized, among the species in this clade, by the shrubby plants with terete young branches, short inflorescences, usually with red axes, and the 2-bracteolate, sessile, 4-merous flowers, with a ciliolate inner portion of the sepals, lanceolate petals, and 4-celled ovaries. This species can be considered as endangered according to IUCN criteria.  
Miconia lucenae R.Goldenb. & Michelang., spec. nov. Diagnosis: Miconia lucenae differs from Miconia paradoxa in having terete young branches (vs. strongly decussate-flattened in M. paradoxa), ciliate inner portion of the sepals (vs. eciliate), and lanceolate petals (vs. obovate). Distribution and niche modelling. Miconia lucenae has been collected 6 times in 4 different places, all of them in the Municipality of Santa Teresa, state of Espírito Santo (Fig. 5). Only one of the samples has an indication on elevation (900 m), but all of them seem to be collected in places with similar elevation. All specimens were collected in shaded areas, in rainforest understory. ... Etymology. Miconia lucenae honors Dr. Sérgio Lucena Mendes, a primatologist at the Universidade Federal do Espírito Santo, and more than once director of the Museu de Biologia Mello Leitão / Instituto Nacional da Mata Atlântica, in Santa Teresa. This tribute is deserved by his efforts on biological research, conservation policies in the state of Espírito Santo, and, more importantly, on his belief that the general public, and mostly the “capixabas” (i.e., people and things from Espírito Santo) must understand and value one of the most unknown and undervalued treasures that they have in their own backyards: the wondrously diverse Mata Atlântica.  Renato Goldenberg, Marcelo Reginato and Fabián A. Michelangeli. 2020. Miconia lucenae (Melastomataceae), A New Species from Montane Atlantic Forest in Espírito Santo, Brazil. PeerJ. 8:e8752. DOI: 10.7717/peerj.8752 |
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