Browsing by Author "Sanjeet Kumar Verma"

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A new species of Podosphaera sect. Sphaerotheca subsect. Magnicellulatae from India and a key to all species reported on Fabaceae
(Magnolia Press, 2020) Sanjay Yadav; Sanjeet Kumar Verma; Raghvendra Singh; Vinay Kumar Singh; Prakash Kushwaha
Podosphaera thermopsidicola, a new sexual morph form of powdery mildew was discovered on living leaves of Thermopsis barbata Benth. (Fabaceae). It is described, illustrated and compared with other Podosphaera species reported on Fabaceae. The phylogeny of this species has been inferred from partial nuclear ribosomal 28S large subunit (LSU) and internal transcribed spacer (ITS) rDNA sequence data. On the basis of LSU, P. thermopsidicola represents characteristic feature of Podosphaera s. str. Phylogenetically, P. thermopsidicola is closer to P. erigerontis-canadensis but differs in having larger chasmothecia, longer appendages, thick-walled asci, smaller oculi and smaller ascospores. © 2020 Magnolia Press
A new species of Podosphaera sect. Sphaerotheca subsect. Sphaerotheca from India—first report of powdery mildew causing wilting and ultimately death of leaves of Filipendula vestita
(Magnolia Press, 2021) Sanjay Yadav; Sanjeet Kumar Verma; Raghvendra Singh
Podosphaera filipendulensis, a new teleomorph of powdery mildew was discovered on living leaves of Filipendula vestita (Rosaceae). It is the first species of powdery mildew that causes wilting and ultimately death of apical infected leaves of F. vestita. It is described, illustrated and compared with other Podosphaera species reported on Rosaceae and a key to all species reported on Rosaceae is provided. The phylogeny of this species has been inferred from internal transcribed spacer (ITS) rDNA sequence data. Phylogenetically, P. filipendulensis is close to P. ferruginea var. ferruginea and P. macularis but differs in having larger chasmothecia, smaller peridium cells, shorter, narrower and aseptate appendages, 8-spored asci and smaller ascospores. Copyright © 2021 Magnolia Press
Addition of three new lineages in Mycosphaerellaceae: Neoacervuloseptoria gen. nov., Neocercosporella gen. nov. and Neoramulariopsis gen. nov.
(Springer Science and Business Media Deutschland GmbH, 2023) Sanjay Yadav; Raghvendra Singh; Sanjeet Kumar Verma; Gargee Singh; Prakash Kushwaha
A colourless hyphomycetous fungus was found on living leaves of Peristrophe bicalyculata in India. Molecular phylogenetic analyses of several loci (LSU-RPB2-ITS) indicated a relationship with cercosporoid fungi (Mycosphaerellaceae). Since there is no other known lineage with similar morphology or DNA sequences, the new genus Neocercosporella is proposed with N. peristrophes comb. nov., based on Cercosporella peristrophes as type species. Pseudocercosporella andrographidis is recognized as new synonym. Similar ultrastructure of conidiogenous loci and hila confirm that N. peristrophes and P. andrographidis are conspecific. The conidiogenous loci are conical and have a small rim-like depression on the top encircling a small flat protuberant structure, which differs from other closely related members of the ramularioid complex. Neocercosporella and Cercosporella s. str. are paraphyletic as are several other genera in the Mycosphaerellaceae. Accordingly, we propose three new genera and four new combinations. The new genera are Neoacervuloseptoria gen. nov., Neocercosporella gen. nov. and Neoramulariopsis gen. nov. The new combinations are Neoacervuloseptoria fraxini comb. nov., Neocercosporella peristrophes comb. nov., Neoramulariopsis catenulata comb. nov. and Neoramulariopsis unguis-cati comb. nov. © 2023, German Mycological Society and Springer-Verlag GmbH Germany, part of Springer Nature.
Cercosporella bundelkhandae comb. nov. From India
(Mycotaxon Ltd, 2020) Raghvendra Singh; Sanjeet Kumar Verma; Sanjay Yadav; Shambhu Kumar
The new combination Cercosporella bundelkhandae ( Pseudocercosporella bundelkhandae) is proposed, based on critical morphological re-examination of the holotype specimen and fresh topotypic material and comparison with closely related species of cercosporoid hyphomycetes. The species was originally collected on living leaves of Tinospora sinensis from Jhansi, Utttar Pradesh, India. © 2020 Mycotaxon Ltd. All rights reserved.
Distocercospora curvulata sp. nov. from northern India
(Mycotaxon Ltd, 2022) Sanjeet Kumar Verma; Sanjay Yadav; Raghvendra Singh
A new species of asexual foliicolous fungus, Distocercospora curvulata, discovered on living leaves of Causonis trifolia from Uttarakhand, India, is described and illustrated. © 2022 Mycotaxon Ltd. All rights reserved.
Molecular phylogeny of Aplosporella abexaminans: a novel species revealing the second report of sexual-asexual connection in Aplosporellaceae (Botryosphaeriales) from India
(Magnolia Press, 2021) Sanjeet Kumar Verma; Sanjay Yadav; Raghvendra Singh
Aplosporella abexaminans, a new sexual morph fungus belongs to family Aplosporellaceae, was discovered on the bark of stem of Murraya koenigii (Rutaceae) and identified by morphological characteristics and analysis of combined ITS and LSU sequence data. This is the second report of a sexual morph with molecular evidence for this genus and the second record of conidiogenesis and chlamydospores associated with the asexual state of this family. It is characterized by its larger ascostromata, locules without ostioles, thinner locule peridium, two to multi-layered, larger asci, surrounded by an additional hyaline sac like structure, larger and hyaline to light olivaceous ascospores, asexual state without conidiomata formation, conidiogenous cells light brown to brown, conidia brown without granular content, smooth and presence of chlamydospores. The sexual morph of Aplosporella abexaminans resembles Bagnisiella and the asexual morph resembles Aplosporella, thus proving the sexual-asexual connection for the second time for this family. © 2021 Magnolia Press.
Morphology and phylogeny of a new species, Pseudocercospora haldinae (Mycosphaerellaceae) on Haldina cordifolia from India
(Magnolia Press, 2021) Sanjay Yadav; Sanjeet Kumar Verma; Vinay Kumar Singh; Raghvendra Singh; Archana Singh; Shambhu Kumar
Pseudocercospora haldinae, a new anamorphic foliicolous hyphomycetous fungus discovered on living leaves of Haldina cordifolia (Rubiaceae) is taxonomically described and illustrated. This species is compared with closely related species of Pseudocercospora and other dematiaceous cercosporoid forms reported on the same host genus. The phylogeny of this species has been inferred from partial nuclear ribosomal 28S large subunit (LSU) and complete internal transcribed spacer (ITS) rDNA sequence data. On the basis of LSU, P. haldinae represents characteristic features of Pseudocercospora s. str. and did not form red crystals when cultivated on agar media. © 2021 Magnolia Press. © 2021 Magnolia Press. All rights reserved.
Morphology and phylogeny of Teratoramularia rumicis—a new foliar pathogen of Rumex crispus from India and diversity of Ramularioid complex on Rumex spp.
(Magnolia Press, 2021) Sanjeet Kumar Verma; Prakash Kushwaha; Sanjay Yadav; Raghvendra Singh
Teratoramularia rumicis, a new hyaline anamorphic foliicolous hyphomycetous fungus was discovered on living leaves of medicinally important plant Rumex crispus (Polygonaceae) is described and illustrated. It is an obligate foliar pathogen that causes silvery white foliar disease. It is the first report of Teratoramularia from India. This species is compared with closely related species of Teratoramularia and species of Ramularioid complex along with dematiaceous cercosporoid forms reported on the same host genus and family. The phylogeny of this species has been inferred from combined 28S nrRNA gene (LSU) and internal transcribed spacer regions and intervening 5.8S nrRNA gene (ITS) of the nrDNA operon. Copyright © 2021 Magnolia Press
Neokamalomyces indicus gen. nov., sp. nov. (Mycosphaerellaceae)—a Septoria-like genus from India
(Magnolia Press, 2022) Sanjay Yadav; Sanjeet Kumar Verma; Raghvendra Singh; Vinay Kumar Singh; Balmukund Chaurasia; Paras Nath Singh; Shambhu Kumar
A new hyaline coelomycetous fungus discovered on living leaves of Ficus benghalensis (Moraceae) is described and illustrated. Morphologically, it is similar to Septoria or septoria-like genus, but based on cultural characteristics and multigene (LSU-RPB2-ITS) phylogenetic analysis this strain represents an additional lineage in Mycosphaerellaceae. Hence, a new genus and species, Neokamalomyces indicus is proposed. Copyright © 2022 Magnolia Press.
Pseudocercospora cappadocici, a new Stigmina-like Pseudocercospora species on Acer cappadocicum from India
(Verlag Ferdinand Berger und Sohne GmbH, 2022) Sanjeet Kumar Verma; Sanjay Yadav; Gargee Singh; Raghvendra Singh
Pseudocercospora cappadocici, a new anamorphic foliicolous hyphomycetous fungus discovered on living leaves of Acer cappadocicum (Sapindaceae) is taxonomically described and illustrated. This species is compared with closely related species of Pseudocercospora and other dematiaceous cercosporoid forms reported on the same host genus. The phylogeny of this species has been inferred from ITS and LSU sequence data. © 2022 Verlag Ferdinand Berger und Sohne GmbH. All rights reserved.
Pseudodeightoniella indica gen. and sp. nov., a hyphomycete from India
(Mycotaxon Ltd, 2021) Sanjeet Kumar Verma; Sanjay Yadav; Raghvendra Singh; Balmukund Chaurasia; Shambhu Kumar
An interesting new mitosporic foliicolous genus and species, Pseudodeightoniella indica, discovered on living leaves of Medicago polymorpha (Fabaceae) from Uttarakhand, India, is described and illustrated. Morphologically, Pseudodeightoniella differs from the closely similar Deightoniella and Neodeightoniella in producing well-developed erumpent stromata, highly undulate to spiral or helicoid and densely fasciculate conidiophores with enlarged basal cells, and conidia lacking mucoid caps. Recently published illustrations of conidia and conidiophores characterizing the Deightoniella and Neodeightoniella type species are also provided. © Mycotaxon, Ltd. 2021.