Phragmidium species parasitizing species of Rosaceae in Tibet, China, with descriptions of three new species

Unveiling new species of Phragmidiaceae (Basidiomycota, Pucciniales) on rosaceous plants from Guizhou, China

Rust fungi associated with Rubus were collected across diverse locations in Guizhou Province, and three new species - Gerwasiaamphidasydis on Rubusamphidasys, Phragmidiumcoreanicola on Rubuscoreanus, and Phragmidiumparvifolius on Rubusparvifolius are introduced. These novel species are described based on morphological characteristics and phylogenetic analysis of the ITS and LSU loci. Additionally, Gerwasiarubi-setchuenensis is introduced as a new host record on Rubusbuergeri. The study includes comprehensive morpho-anatomical descriptions, detailed illustrations, and a phylogenetic tree, providing insights into the taxonomic placement and relationships of these novel taxa within their respective lineages.

Rust Fungi on Medicinal Plants in Guizhou Province with Descriptions of Three New Species

During the research on rust fungi in medicinal plants of Guizhou Province, China, a total of 9 rust fungal species were introduced, including 3 new species (Hamaspora rubi-alceifolii, Nyssopsora altissima, and Phragmidium cymosum), as well as 6 known species (Melampsora laricis-populina, Melampsoridium carpini, Neophysopella ampelopsidis, Nyssopsora koelrezidis, P. rosae-roxburghii, P. tormentillae). Notably, N. ampelopsidis and P. tormentillae were discovered for the first time in China, while M. laricis-populina, Me. carpini, and Ny. koelreuteriae were first documented in Guizhou Province. Morphological observation and molecular phylogenetic analyses of these species with similar taxa were compared to confirm their taxonomic identities, and taxonomic descriptions, illustrations and host species of those rust fungi on medicinal plant are provided.

Four new Phragmidium (Phragmidiaceae, Pucciniomycetes) species from Rosaceae plants in Guizhou Province of China

In this study, four new species of Phragmidium were proposed based on morphological and molecular characters. In morphology, Phragmidiumrosae-roxburghii sp. nov. was distinguished to related taxa by its unique square to diamond-shaped urediniospores; Ph.rubi-coreani sp. nov. differed from Ph.barclayi and Ph.cibanum because of teliospores with fewer cells and shorter pedicels; urediniospores of Ph.potentillae-freynianae sp. nov. were bigger than Ph.duchesneae-indicae; and Ph.rosae-laevigatae sp. nov. produced bigger urediniospores than Ph.jiangxiense. The phylogenetic analyses based on the combination of two loci (ITS and LSU) also supported our morphological conclusion. In the meantime, three previously known species were also described herein.

Taxonomy and Phylogeny of Rust Fungi on Hamamelidaceae

Hamamelidaceae is composed of woody plant taxa of important economic value; however, reports on diseases affecting these plants are rare. Three kinds of rusts were studied, of which the first one is characterized by catenulate spores in peridiate columnar sori on Sycopsis sinensis, the second one produces two-celled pedicellate teliospores in pulvinate sori on S. sinensis and Corylopsis spp., and the last one produces aeciospores in cup-shaped aecia on Hamamelis spp. Phylogenetic analyses indicated that the three species belong to the same genus in Pucciniaceae. The first fungus is distinct in teliospore morphology, producing one-celled catenulate spores in peridiate columnar sori and molecular phylogeny from species of other genera. Thus, it is described herein as a new genus and species Novopuccinia sycopsis-sinensis in Pucciniaceae. The latter two species were reported as Puccinia corylopsidis and Aecidium hamamelidis, respectively. However, phylogenetic analysis using ITS and 28S genes has revealed that these are closely related to the new genus and species. By combining host, distribution, and evolutionary hypothesis of rust fungi with endocyclic life cycle, these are reclassified as N. corylopsidis and N. hamamelidis. Taxonomic descriptions, illustrations, and a key to rust fungal species occurring in Hamamelidaceae in Asia are provided.

Taxonomic revision of species of Kuehneola and Phragmidium on Rosa, including two new species from China

Kuehneola japonica and K. warburgiana are the only species of genus Kuehneola that parasitize plants belonging to genus Rosa (Rosaceae). Systematic revision of the genus Phragmidium and related genera by molecular phylogenetic analyses using nuc rDNA internal transcribed spacer (5.8S-ITS2 = ITS2) and nuc rDNA 28S (28S) sequences indicated that K. japonica and K. warburgiana belong to a group of Phragmidium species that also occur on Rosa. Morphological and molecular phylogenetic analyses revealed that these Kuehneola species were transferred to Phragmidium and renamed as P. japonicum and P. warburgianum. Two new Phragmidium species were also discovered on Rosa from China that could be distinguished from other species in the genus based on aeciospore or urediniospore morphology and phylogenetic placement. The first species, P. jiangxiense, is characterized by a urediniospore surface structure with stout spines that are basally embedded in the wrinkled spore wall. The second species, P. leucoaecium, is characterized by an aeciospore surface structure with irregularly elongated verrucae. Taxonomic descriptions and illustrations are provided.