Phytotaxa

**A nomenclatural note on Leobordea (Crotalarieae, Fabaceae)**

J. STEPHEN BOATWRIGHT — 2025-01-21

N/A

**Pleurotheciaceae in Philippine freshwater ecosystems: new records, asexual morph report of Phaeoisaria filiformis, and phylogenetic assessment**

JAN FELNESH EXE BAGACAY — 2025-01-21

The study of lignicolous freshwater fungi in the Philippines led to the collection and isolation of two Pleurotheciaceae species, belonging to Rhexoacrodictys and Phaeoisaria. Phylogenetic analysis based on the internal transcribed spacer (ITS), beta-tubulin (TUB2), and RNA polymerase II (RPB2) loci revealed that UPVMI 24-0005 belongs to the taxon Rhexoacrodictys erecta, clustering closely with other strains (HSAUPmyr4622, IFRD500-016, HSAUP myr6489) (100% ML, 1.00 BYPP). UPVMI 24-006 was identified as Phaeoisaria filiformis, grouping with the holotype MFLUCC 18-0214 and KUNCC 23-13723 (90% ML, 1.00 BYPP). The present work also confirmed the first report of the asexual morphic stage of P. filiformis, as previous studies only described its sexual morph. Furthermore, the genus Saprodesmium, typified by S. dematiosporum, was transferred to Rhexoacrodictys based on multi-locus phylogenetic analysis, and the generic description is emended. The newly collected specimens represent novel records of Pleurotheciaceae in Philippine freshwater ecosystems. Detailed descriptions, illustrations, and multi-locus phylogenetic analysis of R. erecta and P. filiformis are provided.

**Morphology and multigene phylogeny unveil Waltergamsia xishuangbannaensis sp. nov. (Bionectriaceae, Hypocreales), associated with Pará rubber (Hevea brasiliensis) from Yunnan Province, China**

RUI-MENG LIU — 2025-01-21

During a survey of fungi associated with Pará rubber (Hevea brasiliensis) in Xishuangbanna, Yunnan Province, fungal masses that grew on old rubber latex were collected and isolated. Based on DNA sequences of the internal transcribed spacer ribosomal RNA locus (ITS), the nuclear ribosomal large subunit (LSU), partial translation elongation factor 1-alpha (tef1-α), and RNA polymerase II subunit 2 (rpb2) genes, coupled with morphological characteristics, the isolated fungal strains were identified as a novel fungal species, Waltergamsia xishuangbannaensis. A description, illustrations, and phylogenetic analysis results of the new species are presented. In addition, the new species is compared with closely related taxa.

Conidiobolus srinivasanii (Conidiobolaceae, Entomophthorales), a novel species from Western Ghats, Maharashtra, India

KADAMBARI S. PAWAR — 2025-01-21

The genus Conidiobolus represents fungi of ecological and pathological importance, recently undergoing significant taxonomic revisions driven by molecular advancements. This study describes Conidiobolus srinivasanii sp. nov., a saprobic species isolated from plant litter in Maharashtra, India. Morphological examinations reveal unique features, such as vasiform primary conidiophores, catenate secondary conidia, and multipolar germ tube development, distinguishing it from closely related species. Multigene phylogenetic study (TEF-1α, mtSSU, nucLSU) substantiates its placement within Conidiobolus s.s. while emphasizing genetic divergence from other species. This work integrates morphological observations with genomic data to improve understanding of the taxonomy of this newly described species and underscores the significance of plant litter as a crucial habitat for fungal diversity. These findings aid in the continual refinement of fungal classification and elucidation of the evolutionary complexity of the genus.

Samsoniella doupengshanensis, a new species from Guizhou, China

QIAN ZENG — 2025-01-21

A new species, Samsoniella doupengshanensis, isolated from an infected pupa, is introduced. Morphological comparisons and DNA-based phylogenies from analysis of a multigene dataset of combined ITS, LSU, RPB2 and TEF sequences support establishment of the new species. It differs from other species by its shorter phialides, smaller ellipsoidal conidia and pupa host.

**Revisiting the endemic Eugenia grandifolia (Myrtaceae), a rare species from the Brazilian state of Rio de Janeiro: extended description and conservation**

THIAGO FERNANDES — 2025-01-21

This paper documents the rediscovery of Eugenia grandifolia, an endemic species from the Brazilian state of Rio de Janeiro that was primarily known from 19^th century collections. Eugenia grandifolia is remarkable by its relatively large, subsessile leaves with cordate bases, inflorescences in racemes and often ramiflorous, and fruits with up to seven seeds. We provide herein a second step lectotypification, updated morphological description, notes on taxonomy, distribution, habitat, and phenology of the species. The presence of colleters in the species is first recorded here. Its fruits, previously unknown to science, are illustrated and described herein, and the first photographic documentation of the live plant in its habitat is also presented. Finally, we present a distribution map and a reassessment of the conservation status of E. grandifolia.

Rhododendron yuanbaoshanense (Ericaceae), a new species from Guangxi, China

YI-HUI DENG — 2025-01-21

A new species of Rhododendron (Ericaceae) in subgen. Hymenanthes, sect. Ponticum, subsect. Fortunea from Yuanbaoshan, northern Guangxi, China, namely R. yuanbaoshanense, is described and illustrated. The new species is most similar to R. yuefengense and R. orbiculare, but it differs from R. yuefengense by its broader ovate to orbicular leaf blades with a cordate-auriculate base, cylindric petioles, and longer inflorescence rachis. It is distinguished from R. orbiculare in having 8–17-flowered inflorescences with longer rachis, funnelform-campanulate to campanulate corollas that are pink to pale pinkish-purple and sparsely glandular outside, and densely white glandular style.

Lectotypification of Gastrodia dyeriana King & Pantl. (Orchidaceae), its threat status assessment as per IUCN guidelines and notes on its first authentic voucher specimen from Arunachal Pradesh, India

SAYAK CHAKRABORTY — 2025-01-21

Gastrodia dyeriana King & Pantling [Orchidaceae-Epidendroideae-Gastrodieae], earlier known as an endemic species in India, was first reported from Sikkim. As part of the ongoing revisionary work on the genus Gastrodia Brown, it has been found that the name G. dyeriana is not typified. Therefore, a lectotype has been selected for the name. Moreover, the species was reported from Arunachal Pradesh earlier, which lacked citation of any authentic voucher specimen. During a recent field survey in Arunachal Pradesh, the species was collected from a different location. A detailed description along with photographic illustration, data on phenology, habitat and updated distribution is provided for easy identification. Conservation status of the species has also been assessed during the present study following the IUCN guidelines.

Diderma laiseae (Didymiaceae, Physarales), a new species of Myxomycetes from Brazil

IZABEL CRISTINA MOREIRA — 2025-01-21

We describe a new species, Diderma laiseae, based on detailed morphological analyses. The type material was collected in the field from dead wood and insect remains (coleoptera) within Floresta Nacional de Silvânia, a conservation unit in the Cerrado biome in the state of Goiás, Brazil. D. laiseae is distinguished by its sessile sporophores with prominent, robust transverse and longitudinal ridges that give it a rough appearance, reticular dehiscence caused by the rupture of ridges, and strongly warted spores with irregular lines. We provide a taxonomic description, photographs (optical microscope, stereomicroscope and scanning electron microscope), a comparison with similar species, and a dichotomous key to the species of Diderma occurring in Brazil.