Phytotaxa

New orchids in the flora of Vietnam VIII (Orchidaceae: Epidendroideae, tribes Malaxideae, Neottieae and Podochileae)

2024-04-11T15:07:40+12:00

The paper presents new data on the orchid diversity of Vietnam obtained mainly in the course of the fieldwork in 2020–2023, as well as from the investigation of the collections stored at the Herbaria of Russia and Vietnam. It includes descriptions of four species (Appendicula spicata, Dendrobium khanhii, D. vietii, Listera anthropophora) and one variety (Eria dacrydium var. cornuta) new to science, as well as reports of 18 species new to the flora of Vietnam (Bulbophyllum conchiferum, B. gibbosum, B. lasiochilum, B. malleolabrum, B. medusae, B. mucronatum, B. reclusum, B. siamense, B. sutepense, Dendrobium deltatum, D. densiflorum, D. lampongense, D. polyanthum, Oberonia maxima, Phreatia sulcata, Podochilus lucescens, Sunipia grandiflora and S. rimannii). In addition, a new name, Dendrobium nobile var. luteoalbum, and a new nomenclatural combination, Eria chienii, are proposed, and lectotypes for the names Bulbophyllum mucronatum, B. sutepense, Dendrobium deltatum and D. nobile var. luteoalbum are designated. For each of the studied species, relevant synonyms, studied specimens, ecology, phenology, distribution, conservation status assessment according to the IUCN Red List Categories and Criteria, brief taxonomic notes, and illustrations are provided. For the newly described taxa, morphological descriptions and notes on etymology are included.

**Evidence on the origin of Narcissus ×weickertii (Amaryllidaceae), an endemic daffodil of the SW Iberian Peninsula**

2024-06-07T08:43:32+12:00

The hypothesis regarding the origin of Narcissus ×weickertii through hybridization of its putative parent species, N. papyraceus and N. gaditanus, is investigated in populations from the southwestern of the Iberian Peninsula. Multivariate analyses of quantitative morphological characters in both vegetative and flower structures, coupled with a descriptive analysis of qualitative traits, reveal that N. ×weickertii displays an intermediate morphology between its putative parents. Several anatomical traits of the leaf and scape provide additional support for its hybrid nature. Karyotype analyses show that N. ×weickertii has a 2n=21 karyotype, which falls between those of the putative parent species, with several chromosomes showing an inability to pair. Fluorescence in situ hybridization procedures, encompassing both FISH (targeting NOR regions) and GISH (using total DNA from the putative parents), yield conclusive evidence regarding the hybrid nature of N. ×weickertii and confirm the hypothesis about the identity of their putative parent species. Furthermore, phylogenetic relationships suggest that N. gaditanus likely served as the maternal parent, while N. papyraceus acted as the paternal species, maintaining the hybrid species the style polymorphism of their parent species. The degree of viability observed in the N. ×weickertii pollen grains might indicate that it could bear some possibilities of sexual reproduction beyond the typical vegetative propagation of many described Narcissus hybrid species.

**Two new species of Cystodermella and new combinations in Ripartitella (Agaricineae, incertae sedis) and Cystolepiota (Verrucosporaceae)**

2024-04-29T13:03:51+12:00

Two new species of Cystodermella, C. canadensis and C. rubrogranulosa, are described based on phylogenetic and morphological grounds, and compared with similar species. Four holotypes were barcoded: Agaricus terryi, Cystoderma texense, Lepiota sipariana and Melanoleuca vinosa. Two new combinations are proposed: Melanoleuca vinosa as Ripartitella vinosa, and Cystodermella contusifolia as Cystolepiota contusifolia. Cystodermella cristallifera and C. sipariana are found to be conspecific; the older name, C. sipariana, should be adopted and C. cristallifera deprecated as a later synonym. The holotypes of three species: Agaricus terryi, Cystoderma texense and Cystodermella mazahuanensis all represent Cystodermella cinnabarina, for which a neotype is selected.

Saurauia decolorata (Actinidiaceae), a new species from Mindanao, the Philippines

2024-02-29T14:09:14+13:00

Saurauia decolorata from the Mt. Pantaron Range, Bukidnon and Mt. Balatukan Natural Park, Misamis Oriental, Mindanao Island, the Philippines, is illustrated and described as a new species. It closely resembles S. avellana and S. elegans in having branchlets, petioles, and abaxial surfaces of the leaves covered with tomentum and scales, densely clustered flowers, longitudinal anther dehiscence, and 3–4 styles. However, S. decolorata is distinguished from these species by its prominent rusty-colored tomentum and scales on branchlets and abaxial leaf surfaces, cordate leaf bases, crenate margin, 16–21 pairs of lateral veins, fascicled-cymose inflorescences that are both axillary and ramiflorous, and sparsely scaly pinkish green outer sepals. This discovery further emphasizes the unique biodiversity of the forests of the Pantaron Range and Mt. Balatukan which urgently need legislative protection and enhanced protected area management plans, respectively.

Brachystele guayanensis is a Cyclopogon (Orchidaceae): notes on its biology and taxonomy

2024-02-18T03:08:30+13:00

Brachystele guayanensis is hereby transferred to the genus Cyclopogon based on molecular systematics and morphological evidence. The major change in the circumscription of Cyclopogon with the inclusion of this species is an increase in the number of flowers per inflorescence, a reduction in flower size, and the fact that sepals may become petaloid.

Erratum: ROHAN MAITY, KRISHNA CHOWLU & SUDHANSU SEKHAR DASH (2024) The current status of Henckelia peduncularis (Gesneriaceae): Taxonomy, typification, distribution and IUCN Red List assessment. Phytotaxa 644 (1): 27–34.

2024-05-18T16:50:12+12:00

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