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Friday, January 10th, 2025
| Time | Event | ||||||
| 2:08a | [Botany • 2025] Petalidium hoarusibense (Acanthaceae: Ruellieae) • A New Species from northwestern Namibia
Abstract Petalidium hoarusibense, hitherto misidentified as P. rossmannianum and P. ohopohense, is here described as a new species. It is a range-restricted species, only known from the area to the south and southeast of Okandjombo in the Kaokoveld Centre of Endemism, northwestern Namibia, where it grows on arid hillsides and along ephemeral riverbeds and drainage lines. Diagnostic characters for P. hoarusibense include the pale grey appearance of the plants, single or multi-stemmed from a thick rootstock, vegetative parts with a dense white indumentum of short dendritic, simple and bifurcate trichomes appearing matted, flowers borne in short, few-flowered dichasia, and bracteoles narrowly ovate or elliptic, deeply concave, appearing cobwebbed due to a mixture of loosely entangled long simple and dendritic trichomes. The flowers of P. hoarusibense are distinctive in having the lobes magenta with the anterior lobe sometimes slightly lighter shaded than the others and with two separate narrowly triangular yellow nectar guides. A comparison of key morphological features distinguishing P. hoarusibense from P. kaokoense, its closest relative in appearance, as well as from P. ohopohense, P. rossmannianum, P. sesfonteinense, and P. welwitschii, is provided. Based on IUCN Red List criteria, a provisional conservation assessment of Vulnerable (VU) is recommended for the new species. endemism, flora, Kaokoveld, Kaokoveld Centre of Endemism, Kunene Region, Namib Desert, Ruellieae, Okandjombo, Hoarusib River, taxonomy, Eudicots
Petalidium hoarusibense Swanepoel & A.E.van Wyk, sp. nov. Diagnosis:—A woody dwarf shrub up to 1.2 m tall, morphologically most similar to Petalidium kaokoense, from which it differs in having indumentum on the bracteoles cobwebbed, consisting of a mixture of loosely entangled simple and dendritic trichomes up to 2.5 mm long, with in addition scattered short-stalked glandular trichomes (vs. matted/compact, stellate and dendritic, shorter, up to 0.5 mm long, lacking glandular trichomes); corolla glabrous outside (vs. exposed part strigose); nectar guides on anterior lobe narrowly triangular, separate (vs. linear-oblong, confluent or nearly so). Etymology:—The specific epithet refers to the Hoarusib River and its catchment to which Petalidium hoarusibense is endemic. Wessel SWANEPOEL and Abrahan E. van WYK. 2025. Petalidium hoarusibense (Acanthaceae), A New Species from Namibia. Phytotaxa. 681(1); 1-10. DOI: doi.org/10.11646/phytotaxa.681.1.1 | ||||||
| 3:44a | [Botany • 2024] Amanoa tolimensis (Phyllanthaceae: Phyllanthoideae)• A New Timber Species endemic to Colombia’s Montane Forests and Critically Endangered, with an Updated Key for the Species of the Genus
Abstract Amanoa tolimensis, a critically endangered new timber tree species from Andean forests of Colombia is described, illustrated, and its distinctive morphological structures are displayed through a Lankester plate. A. tolimensis is recorded so far in montane forests over sandy-clay soils of “Bosque de Galilea” Regional Natural Park, an area located on the western flank of the eastern mountain range of Tolima department. This new species belongs to a small group within the genus characterized by the presence of an androphore, and presents morphological similarities with A. almenrindae. The latter, is a shrub to small tree from black water periodically flooded forests and savannas of Rio Negro basin of Brazil, Colombia and Venezuela. This new species is a tree 24 m tall, with branches and inflorescence lenticellate, with a ferruginuous tomentum, presenting differences in shape and size in leaves, petioles, pedicels, sepals, ovary, and the pistillate flowers are pedicellate. Additionally, habitat, phytogeographical information, a distribution map, and data about its conservation status are included. An updated identification key for the neotropical species of Amanoa is also provided. This new species represents the first report of this genus in Colombian Andes, and the first endemism of this genus for the country. Amanoa tolimensis is under pressure from logging in some areas of the park, and urgent protection of the species is needed. Alma Negra, Andes, Doselia galilensis, endangered tree, Galilea, Cordillera oriental, Eudicots   Amanoa tolimensis Villanueva & Corrales-Bravo, sp. nov. Etymology: — The epithet “tolimensis” refers to the name of Tolima Department, the political region where this new species occurs.  Boris VILLANUEVA-TAMAYO, Lina M. Corrales BRAVO and Gerardo A. AYMARD-CORREDOR. 2024. A New Timber Species of Amanoa (Phyllanthaceae; Phyllanthoideae) Endemic to Colombia’s Montane Forests and Critically Endangered, with an Updated Key for the Species of the Genus. Phytotaxa. 672(2); 187-198. DOI: doi.org/10.11646/phytotaxa.672.2.5 | ||||||
| 9:12a | [PaleoBotany • 2025] Palaeopteridium andrenelii • A New noeggerathialean Species from the Middle Pennsylvanian of Portugal with new insights on the Noeggerathiales
Abstract Noeggerathiales were until recently a group of plants with uncertain systematic position that existed in the Carboniferous and Permian times. Recent discoveries classify them as heterosporous progymnosperms. Despite the discovery of additional specimens, the group still remains highly artificial because their reproductive organs are rarely preserved in organic connection. Within the Carboniferous of Iberian Massif, the noeggerathialeans are poorly represented. Here, we describe Palaeopteridium andrenelii sp. nov. from the uppermost Carboniferous of Portugal. This is the second representative of Noeggerathiales reported in the Portuguese Carboniferous after Carlos Teixeira have described the noeggerathialean Rhacopteris gomesiana in the 1940s from Douro Carboniferous Basin (Stephanian C/lower Gzhelian, Upper Pennsylvanian). Palaeopteridium andrenelii was found in upper Asturian (upper Moscovian, Middle Pennsylvanian) strata from the classical Westphalian outcrops of Ervedosa, located in the region of Alto da Serra (Fânzeres), Gondomar, in northwestern Portugal. Two reproductive structures are associated with the frond of the new fossil species. Although not organically linked, both structures could belong to parent plant (frond) and represent possible detached macrosporangia. This reenforces the Palaeopteridium as a noeggerathialean and the first reproductive structures found for this genus. Keywords: Palaeopteridium, Noeggerathiales, macrosporangia, Ervedosa flora, upper Asturian (upper Moscovian; Middle Pennsylvanian), Gondomar, Portugal
Division: †Progymnospermophyta Bold et al. Class: †Noeggerathiopsida Kryshtofovich Order: †Noeggerathiales Nĕmejc emend. Wang et al. (2021) Fossil-family: Discinitaceae Zhifeng & Thomas Fossil-genus: Palaeopteridium Kidston (1923) Type species: Palaeopteridium reussii (Ettingshausen) Kidston (1923) from Westphalian Series of the Carboniferous Rocks of Great Britain. Basionym: Asplenites reussii Ettingshausen (Ettingshausen, 1852), ‘Steinkohlenflora von Stradonitz in Böhmen’, Ablandl. K.K. geol. Reichsanst., Band I, Abth. 3, No. 4, p. 16, pl. I, Figures 8, 9 (Kidston, Reference Kidston1923, p. 201) Palaeopteridium andrenelii sp. nov. Diagnosis. Bipinnate frond with subopposite or alternate pinnules, relatively symmetrical and spaced, sometimes touching or slightly overlapping, obliquely attached to an ultimate rachis by a very narrow base (1.5–2.0 mm long and 0.8–1.0 mm wide) − petiolate attachment. Ultimate rachis very thin, straight or slightly flexuous, detached from a possible penultimate rachis. Fan-shaped (flabelliform or semiflabelliform type) pinnules, of 7–8 mm long and a maximum fan width of about 5−6 mm, with entire lateral and crenate/lobed distal margins. Distal margins bearing irregular and asymmetrical 12−14 crenate-shaped teeth/lobes of about 0.3−1.0 mm long. Venation pattern of open dichotomous showing a single vein entering each pinnule, giving rise to a series of radiating veinlets of equal strength which in their course to the margin divide three or four times. There are 14–20 veins on distal margin of pinnule. Etymology. The specific name ‘andrenelii’ honours André Nel from Muséum National d’Histoire Naturelle (Paris), a world expert in palaeoentomology and honourable colleague who has been cooperating with us on the systematic study of new insect fossils recently described in the Douro and Buçaco Basins (Loureiro et al. 2010; Correia et al. 2014 b; Correia et al. 2021 c; Correia & Nel, 2023; Correia et al. 2023 c). Type locality. Outcrops located in the northeast banks of road Dom Miguel, Seixo (Fânzeres) region, Gondomar, northwestern Portugal (Fig. 1). Type horizon and age. Horizon composed of laminated and compact grey shales; late Westphalian D (late Asturian/late Moscovian, Middle Pennsylvanian). Pedro Correia and Carlos A. Góis-Marques. 2025. Palaeopteridium andrenelii sp. nov., A New noeggerathialean Species from the Middle Pennsylvanian of Portugal with new insights on the Noeggerathiales. Geological Magazine. 162, e1. DOI: doi.org/10.1017/S0016756824000438 | ||||||
| 9:32a | [Botany • 2020] Dendrobium jinghuanum (Orchidaceae: Epidendroideae) • A New orchid Species from Yunnan, China: evidence from both morphology and DNA
Abstract A new orchid species, Dendrobium jinghuanum (Epidendroideae, Orchidaceae), from Yunnan Province, China, is described and illustrated based on morphological and molecular data. Morphological investigations indicated this new orchid is similar to D. bensoniae, D. crystallinum, and D. wardianum, but it can be differentiated easily from them by associated characteristics: 7-veined sepals, 9-veined petals, a chestnut blotch on either side of lip disk, an anther cap with distinct crystalline papillae, and stems without swollen nodes. Molecular phylogeny analyses showed that D. jinghuanum is a member of section Dendrobium s.l. and sister to D. bensoniae but not D. crystallinum or D. wardianum. Chinese orchid flora, Dendrobium sect. Dendrobium, orchid phylogenetics, Yunnan, orchids, Monocots
Dendrobium jinghuanum B.Q.Zheng & Y.Wang, sp. nov. (景华石斛) Bao-Qiang ZHENG, Long-Hai ZOU, Xiao WAN and Yan WANG. 2020. Dendrobium jinghuanum, A New orchid Species from Yunnan, China: evidence from both morphology and DNA. Phytotaxa. 428(1); 30–42. DOI: doi.org/10.11646/phytotaxa.428.1.3 | ||||||
| 10:02a | [Botany • 2020] Dendrobium yongjiaense (Orchidaceae: Epidendroideae) • Morphological and Molecular Evidence for A New Species from China
Abstract A new orchid species, Dendrobium yongjiaense, from Zhejiang, China, is described and illustrated here. Detailed morphological study indicates that D. yongjiaense is similar to D. monticola and D. strongylanthum, but it differs in the shape and size of leaf, flower size, and a mid-lobe of the lip with densly distinct crystalline papillae and wrinkled 3–5 crest lines in middle. Molecular phylogeny analyses based on the nrITS and plastid DNA (matK and trnL-F) reveal that D. yongjiaense is a member of sect. Stachyobium, and genetically similar to D. monticola. Keywords: Chinese orchid, Dendrobiinae, Epidedroideae, phylogeny of Dendrobium, Monocots   Dendrobium yongjiaense Z.Zhou & S.R.Lan, sp. nov. (永嘉石斛) Zhuang ZHOU, Sai ZHANG, Yan-Ping YANG, Liang MA and Si-Ren LAN. 2020. Morphological and Molecular Evidence for A New Species from China: Dendrobium yongjiaense (Orchidaceae: Malaxideae). Phytotaxa. 441(2); 203–210. DOI: doi.org/10.11646/phytotaxa.441.2.7 | ||||||
| 10:11a | [Botany • 2024] Taxonomic Revision of the formerly monotypic Orchid Genus Dactylostalix (Orchidaceae)
Abstract The Calypsoinae orchid genus Dactylostalix, previously considered a monotypic genus endemic to Japan and the Russian Far East (the Kuril Islands and Sakhalin Island), is now redefined to encompass two species. This reclassification is based not only on the examination of type specimens and literature but also on molecular data. While Pergamena uniflora has long been regarded as a synonym of Dactylostalix ringens, it is distinguishable by its shorter scape, smaller flower, less spotted tepals, drooping sepals and lateral petals, labellum with smaller, narrowly triangular to ovate lateral lobes, more distinct keels on the adaxial surface of the lip, and a slender column with a smaller stigma and weakly developed clinandrium. We propose the new combination Dactylostalix uniflora, recognizing it as a distinct species within the genus Dactylostalix. Phylogenetic analysis utilizing genome-wide markers has also demonstrated that the two species are genetically distinct. Our findings, obtained through the integration of morphological data and molecular phylogenetics, indicate that D. uniflora represents a distinct evolutionary lineage from D. ringens. Examination of type specimens has led us to conclude that Calypso japonica, Dactylostalix maculosa, and Dactylostalix ringens f. punctatus are junior synonyms of D. ringens. Additionally, we designate the lectotypes for P. uniflora (= D. uniflora), C. japonica, and D. maculosa. emended description, genetics, morphology, new combination, taxonomy, typification, Monocots
Dactylostalix Reichenbach (1878:74) Type:—Dactylostalix ringens Reichenbach (1878: 74). Dactylostalix uniflora (Finet) Suetsugu, comb. nov. Kenji Suetsugu, Shun K. Hirota, Takahiro Yagame, Tomohisa Yukawa, Yoshihisa Suyama. 2024. Taxonomic Revision of the formerly monotypic Orchid Genus Dactylostalix. Phytotaxa. 652(2); 83-99. DOI: doi.org/10.11646/phytotaxa.652.2.1 | ||||||
| 3:00p | [PaleoBotany • 2024] Phoenicites insula-lacuna • A fossil pinnate palm leaf (Arecaceae: Arecoideae) from Island Lagoon, in the arid zone of South Australia
ABSTRACT Fossil pinnate palm leaves (Arecaceae, subfam. Arecoideae) are described from the Eocene or Miocene Island Lagoon fossil site near Woomera in the arid zone of South Australia. These leaves are described as a new species, Phoenicites insula-lacuna and shown to share morphological similarities to the extant genus Archontophoenix (subtr. Archontophoenicinae), endemic to eastern Australia. This fossil record constitutes a significant temporal and geographic range extension for Archontophoenicinae and likely Archontophoenix. The presence in Australia of Archontophoenicinae as early as the Eocene or more likely Miocene, is in accordance with molecular analyses that propose dispersal of this clade into Australia from New Guinea, with subsequent dispersal from Australia to New Caledonia and divergence of the Archontophoenix and Chambeyronia lineages during this interval of time. Previously reported co-occurring myrtaceous woody fruits from Island Lagoon and proximal-coeval silcrete floras previously referred to Angophora, Callistemon, Eucalyptus, Melaleuca and fossils of other sclerophyllous taxa such as Banksia are consistent with this palm being part of a landscape mosaic with riparian rainforest that included mesic plants growing within wider sclerophyllous forest or woodland vegetation comparable to the eastern coastal zone of modern-day Australia and the modern range of Archontophoenix. KEYWORDS: Palm, Arecaceae, paleogene–neogene, Australia, Archontophoenix, silcrete macrofloras
Order: Arecales Bromhead (1840) Family Arecaceae Bercht. et Presl (1820), nom. cons. et nom. alt. Subfamily Arecoideae Burnett (1835) Fossil genus Phoenicites Brongn. emend Read and Hickey (Citation1972) Type species Phoenicites pumila Brongniart, 1828, from the Eocene Brives region of France. Phoenicites insula-lacuna D.R.Greenw. & Conran, sp. nov. Diagnosis: Pinnate leaf with 11 or more pinnae per side. Rachis straight, rounded, minutely tuberculate or dotted. Pinnae linear-lanceolate, subopposite, reduplicate, inserted in a single plane along the rachis at acute angles (17–34°; n = 10), with 6–8 prominent lateral secondary veins and narrower at the base than medially; bases asymmetrical, broader basioscopically. Etymology: The specific epithet is derived from the Latin for Island Lagoon, the fossil’s locality. Location: Unnamed Tertiary unit at the decommissioned Island Lagoon tracking station, South Australia (31° 23′S, 136° 53′E, 139 m). David R. Greenwood and John G. Conran. 2024. A fossil pinnate palm leaf (Arecaceae, subfam. Arecoideae) from Island Lagoon, in the arid zone of South Australia. Historical Biology: An International Journal of Paleobiology. DOI: doi.org/10.1080/08912963.2024.2403591 |
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