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Saturday, April 27th, 2024
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| 2:16a | [Botany • 2024] Sanjappa vietnamica (Fabaceae: Caesalpinioideae) • Studies of Asian ‘Calliandra' lead to expansion of Sanjappa
Abstract The genus Sanjappa, previously with the single species S. cynometroides in southern India, is expanded to include S. umbrosa, comb. nov., in northeastern India, Bangladesh, Myanmar and China (Yunnan) and S. vietnamica, sp. nov., in southern Vietnam. Sanjappa differs from Thailentadopsis, its sister genus in the Zapoteca clade, by having leaves with extrafloral nectaries in the form of sessile (versus stipitate) glands and elastically dehiscent, not moniliform pods (versus pods not elastically dehiscent and submoniliform). Sanjappa umbrosa and S. vietnamica differ from S. cynometroides by having bipinnate leaves with one pair of pinnae (versus simply pinnate leaves with two leaflets only) and a four-lobed (versus three-lobed) corolla. In S. umbrosa each pinna is 2–3-foliolate and paired stipular spines are mainly present on younger growth, whereas in S. vietnamica each pinna is (3–)4–5-foliolate and branches, including major ones, are armed with numerous paired spines with thickened bases. Synonymies, images and notes on distribution, habitat, taxonomy and conservation for the three species of Sanjappa are provided, and all names are typified. With the taxonomic changes proposed here, all Asian species previously treated as members of Calliandra have been accommodated outside this genus. Keywords: lectotypification, taxonomy, Thailentadopsis, Zapoteca clade Sanjappa E.R.Souza and Krishnaraj (Souza et al. 2016) Type: Sanjappa cynometroides (Bedd.) E.R.Souza and Krishnaraj. Sanjappa cynometroides (Bedd.) E.R.Souza and Krishnaraj (Souza et al. 2016) Sanjappa umbrosa (Wall.) Thulin, comb. nov.
Sanjappa vietnamica Thulin, sp. nov. A species with bipinnate leaves with one pair of pinnae as in Sanjappa umbrosa (Wall.) Thulin, but differing by having each pinna with (3–)4–5 (versus 2–3) leaflets and by having major branches armed with paired spines with thickened bases (versus spines mainly on younger growth). Mats Thulin. 2024. Studies of Asian ‘Calliandra' lead to expansion of Sanjappa (Fabaceae-Caesalpinioideae). Nordic Journal of Botany. DOI: 10.1111/njb.04241 | ||||||
| 7:50a | [PaleoBotany • 2024] Hymenaeaphyllum mirandae n. gen. n. sp. (Leguminosae: Detarioideae) • A New extinct Member of the Resin Producer Group of the Mexican Amber
Abstract One of the most important amber deposits with bioinclusion outcrops in Chiapas, southern Mexico, dated ca. 23–15 Ma (early–middle Miocene). Angiosperms (flowering plants) are the most frequently recorded group, with ca. 16 families based principally on fossil flowers and occasional leaves, including members of Leguminosae. This study reports new bifoliolate-compound leaves preserved in Mexican amber, represented by a pair of leaflets marginally attached to a short petiole. Each leaflet is ovate to oblong with an entire margin and has an acuminate apex with a pinnate primary vein. Their characteristics are comparable with bifoliate compound leaves of extant members of Cercidoideae, Caesalpinioideae, and Detarioideae subfamilies. Their asymmetrical base, brochidodromous secondary veins, and abundant translucid glands allow establishment of a new extinct resin-producing member of the Hymenaea clade (Detarieae, Detarioideae), Hymenaeaphyllum mirandae n. gen. n. sp. Hymenaea clade includes Guibourtia, Hymenaea, and Peltogyne, all with similar foliar architecture and other plant characteristics, including reproductive structures. The connection of Hymenaeaphyllum mirandae with extinct members of resin-producing plants recognized previously is uncertain. The discovery of Hymenaeaphyllum mirandae in the Mexican amber suggests that the Boreotropical Flora extended to low latitudes of North America during the Miocene. Keywords: Amber, bifoliate leaves, Detarieae, Leguminosae, Miocene
Family Leguminosae Jussieu Subfamily Detarioideae Burmeister Tribe Detarieae de Candolle Clade Hymenaea (sensu Fougère-Danezan et al., 2010) Hymenaeaphyllum Hernández-Damián, Rubalcava-Knoth and Cevallos-Ferriz, n. gen. Etymology: Highlighting the remarkable similarity of a vegetative organ (leaf) to the Hymenaea clade. Generic diagnosis: Bifoliolate-compound leaves; two petiolulate leaflets, slightly asymmetrical; petiolule bases pulvinulate; leaflets with asymmetrical base with basal insertion asymmetrical; apex acuminate; elliptical to slightly oblong shape; pinnate primary vein, becoming thinner distally; second-order venation simple brochidodromous, forming irregular arches distally; third-order venation is reticulate irregular but sometimes mixed percurrent veins can be found; translucent gland dots are distributed on the surface of the leaflets in a very high density (50.9 per mm2). Hymenaeaphyllum mirandae Hernández-Damián, Rubalcava-Knoth and Cevallos-Ferriz, n. sp. Etymology: The epithet recognizes Dr. Faustino Miranda, a pioneer in the study of plants in Mexican amber. Repository: Colección Nacional de Paleontología, Museo María del Carmen Perrilliat M., Instituto de Geología, Universidad Nacional Autónoma de México (IGM-PB). Locality: Simojovel de Allende, Chiapas. Stratigraphy: La Quinta Formation. Age: Early–middle Miocene.
Conclusions: Hymenaeaphyllum mirandae n. gen. n. sp. from Mexican amber is evidence of a geological history of Leguminosae in the Neotropical region during the early–middle Miocene. Foliar characteristics such as leaflets with asymmetrical bases, brochidodromous secondary veins, and translucent gland dots support its inclusion into Detarioideae, especially into the Hymenaea clade, whose members are resin-producing trees. However, it is uncertain how this new species relates to the known extant genera of the clade (Hymenaea, Guibourtia, Peltogyne) due to the remarkable similarity of their foliar architecture and lack of further morphological evidence. This new extinct member of Detarioideae supports the extension of the Boreotropical Flora into the low latitude of North America. However, evidence from other groups of plants suggests that the Boreotropical biogeographic route is essential in extending the distribution of tropical plants into low-latitude North America. Ana L. Hernández-Damián, Marco A. Rubalcava-Knoth and Sergio R.S. Cevallos-Ferriz. 2024. A New extinct Member of the Resin Producer Group of the Mexican Amber: Hymenaeaphyllum mirandae n. gen. n. sp. (Detarioideae-Leguminosae). Palaeoworld. In Press. DOI: 10.1016/j.palwor.2024.04.004 | ||||||
| 4:37p | [Funga • 2024] Cystolepiota flavolamellata (Agaricales: Verrucosporaceae) • A New Species from Southeast Asia
Abstract We present Cystolepiota flavolamellata a new species discovered in the tropical regions of Thailand and Laos. Morphological characters and multigene phylogenetic analyses, which encompass ITS, LSU, rpb2, and tef1 sequences, distinguish this species. Cystolepiota flavolamellata exhibits the following unique set of characteristics: basidiomata covered with light brown to brown granules or large pyramidal squamules; free yellowish white to light yellow lamellae; broadly ellipsoid to oblong-amygdaliform to ovoid basidiospores; absence of pleurocystidia; variably shaped cheilocystidia, i.e., oblong, clavate with or without appendicular apex, conical to utriform, fusiform; an epithelium for the pileus and stipe covering; and presence of clamp connections. Molecular analyses based on multiple genes confirm its separation from other known and sequenced Cystolepiota species. fungi, fungal diversity, litter-inhabiting fungi, taxonomy  Cystolepiota flavolamellata Salichanh, Sysouph., & Luangharn Thaviphone Salichanh, Phongeun Sysouphanthong, Naritsada Thongklang and Thatsanee Luangharn. 2024. Cystolepiota flavolamellata (Verrucosporaceae, Agaricales), A New Species from Southeast Asia. Phytotaxa 645(1); 18-28. DOI: 10.11646/phytotaxa.645.1.2 | ||||||
| 4:38p | [Botany • 2024] Impatiens neo-uncinata (Balsaminaceae) • A New Species from southern Western Ghats of Kerala, India
Abstract A new species, Impatiens neo-uncinata, belonging to section Scorpioidae is described and illustrated from Thiruvananthapuram district of Kerala in the southern Western Ghats. It is morphologically similar to Impatiens unicinata, but can easily be distinguished in having milky white distal lobe of keel petal, deltoid shape of standard petals and 1–2 seeded capsules. Furthermore, the SEM analysis of pollen and seed also delineate the taxa. Impatiens neo-uncinatais assessed here as Endangered based on the categories and criteria of the IUCN Red List. Eudicots, Agasthyamala biosphere reserve, Impatiens, Scorpioidae, taxonomy    Impatiens neo-uncinata V.S.A.Kumar & Sindhu Arya Arya Sindhu and Venugopalan Nair Saradhamma Anil Kumar. 2024. Impatiens neo-uncinata (Balsaminaceae), A New Species from southern Western Ghats of Kerala, India. Phytotaxa. 644(1); 1-9. DOI: 10.11646/phytotaxa.644.1.1   | ||||||
| 4:38p | [Botany • 2024] Primulina hoangmongii (Gesneriaceae) • A New Species from northern Vietnam
Abstract Primulina hoangmongii, a new species from Yen Bai Province of northern Vietnam, is described and illustrated. It is similar to P. albicalyx in its robust rhizome, rosette leaves, and yellow flowers. However, P. hoangmongii is clearly distinguished by its linear to narrowly-lanceolate bracts, 8–12 × 2–3 mm (vs. narrowly ovate to ovate, 18–25 × 9–14 mm), green calyx (vs. white), rich yellow corolla (vs. pale yellowish), base of the upper lip flat, thin and rich pure yellow (vs. swelling between lobes, yellow-brownish), and a ligulate, entire stigma (vs. deltoid, 2-lobed). The conservation status of P. hoangmongii is preliminarily assessed according to IUCN criteria as Critically Endangered (CR). plant diversity, endemism, plants of limestone karst, plant taxonomy, Eudicots   Khang Sinh Nguyen, Leonid V. Averyanov and Che Wei Lin. 2024. Primulina hoangmongii (Gesneriaceae), A New Species from northern Vietnam. Phytotaxa. 645(2); 179-185. DOI: 10.11646/phytotaxa.645.2.7  |
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