Pseudodidymella fagi gen. et sp. nov. and Its Hyphomycete Anamorph Pycnopleiospora fagi gen. et sp. nov. on Fagus crenata in Japan

Wei, Chuan Zhao; Harada, Yukio; Katumoto, K.

doi:10.2307/3761043

Cited by 8 publications

(28 citation statements)

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“…The genera Mycodidymella and Pseudodidymella are also members of Melanommataceae that produce mycopappus-like propagules in their asexual morphs ( Wei et al., 1997 , Wei et al., 1998 , Gross et al., 2017 ). The genus Mycodidymella , which is based on the type species Mycod.…”

Section: Introductionmentioning

confidence: 99%

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Pseudodidymellaceaefam. nov.: Phylogenetic affiliations of mycopappus-like genera inDothideomycetes

Hashimoto

Matsumura

Hirayama³

et al. 2017

Studies in Mycology

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The familial placement of four genera, Mycodidymella, Petrakia, Pseudodidymella, and Xenostigmina, was taxonomically revised based on morphological observations and phylogenetic analyses of nuclear rDNA SSU, LSU, tef1, and rpb2 sequences. ITS sequences were also provided as barcode markers. A total of 130 sequences were newly obtained from 28 isolates which are phylogenetically related to Melanommataceae (Pleosporales, Dothideomycetes) and its relatives. Phylogenetic analyses and morphological observation of sexual and asexual morphs led to the conclusion that Melanommataceae should be restricted to its type genus Melanomma, which is characterised by ascomata composed of a well-developed, carbonaceous peridium, and an aposphaeria-like coelomycetous asexual morph. Although Mycodidymella, Petrakia, Pseudodidymella, and Xenostigmina are phylogenetically related to Melanommataceae, these genera are characterised by epiphyllous, lenticular ascomata with well-developed basal stroma in their sexual morphs, and mycopappus-like propagules in their asexual morphs, which are clearly different from those of Melanomma. Pseudodidymellaceae is proposed to accommodate these four genera. Although Mycodidymella and Xenostigmina have been considered synonyms of Petrakia based on sexual morphology, we show that they are distinct genera. Based on morphological observations, these genera in Pseudodidymellaceae are easily distinguished by their synasexual morphs: sigmoid, multi-septate, thin-walled, hyaline conidia (Mycodidymella); globose to ovoid, dictyosporus, thick-walled, brown conidia with cellular appendages (Petrakia); and clavate with a short rostrum, dictyosporus, thick-walled, brown conidia (Xenostigmina). A synasexual morph of Pseudodidymella was not observed. Although Alpinaria was treated as member of Melanommataceae in a previous study, it has hyaline cells at the base of ascomata and pseudopycnidial, confluent conidiomata which is atypical features in Melanommataceae, and is treated as incertae sedis.

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Section: Introductionmentioning

confidence: 99%

“…1997 ). The species was found to be associated with brown leaf spots of Fagus crenata in Japan, and was originally characterised by lenticular ascomata with a well-developed basal stroma and a pycnopleiospora-like asexual morph, which is characterised by sporodochial conidiomata and conidia with appendages ( Wei et al. 1997 ).…”

Section: Introductionmentioning

confidence: 99%

Pseudodidymellaceaefam. nov.: Phylogenetic affiliations of mycopappus-like genera inDothideomycetes

Hashimoto

Matsumura

Hirayama³

et al. 2017

Studies in Mycology

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“…A mycopappus‐like propagule may have evolved at least three times in the Ascomycota: Mycosphaerellaceae (Capnodiales, Dothideomycetes; this study), Pseudodidymellaceae (Pleosporales, Dothideomycetes; Funk & Dorworth, ; Gross et al., ; Hashimoto et al., ; Wei et al., , ) and Sclerotiniaceae (Helotiales, Leotiomycetes; Redhead & White, ; Suto & Kawai, ; Suto & Suyama, ; Takahashi et al., ). This appears to have resulted from convergent evolution of a similar ecological function, such as rain‐splash dispersal across the leaf surface.…”

Section: Discussionmentioning

confidence: 67%

“…"Mycosphaerella" polygoni-cuspidati is known to cause leaf spot disease in Fallopia japonica (Houtt.) Ronse Decr., and its life cycle involving a sexual morph and spermatial stage has been described (Kurose et al, 2009(Kurose et al, , 2016 Funk & Dorworth, 1987;Gross et al, 2017;Hashimoto et al, 2017;Wei et al, 1997Wei et al, , 1998 and Sclerotiniaceae (Helotiales, Leotiomycetes;Redhead & White, 1985;Suto & Kawai, 2000;Suto & Suyama, 2005;Takahashi et al, 2006). This appears to have resulted from convergent evolution of a similar ecological function, such as rain-splash dispersal across the leaf surface.…”

Section: Discussionmentioning

confidence: 99%

“…More than 70 fungi are known as pathogens of plant species in Styracaceae (Farr & Rossman, ), but none are similar to the fungus described here. Several mycopappus‐like genera have been reported in Pseudodidymellaceae (Dothideomycetes; Funk & Dorworth, ; Gross et al., ; Hashimoto, Matsumura, Hirayama, Fujimoto, & Tanaka, ; Wei, Harada, & Katumoto, , ) and in Sclerotiniaceae (Leotiomycetes; Redhead & White, ; Suto & Kawai, ; Suto & Suyama, ; Takahashi, Matsushita, Hogetsu, & Harada, ). The present fungus differs from other mycopappus‐like genera by having melanized propagules with hyphal appendages that collapse at maturity.…”

Section: Introductionmentioning

confidence: 99%

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Collapsimycopappus: A new leaf pathogen with mycopappus‐like propagules in Mycosphaerellaceae

et al. 2018

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A previously undescribed mycopappus‐like fungus associated with large zonate leaf spot disease of Styrax obassia was found in Japan. Single‐propagule isolation of the fungus from necrotic areas of the diseased leaves yielded four pure cultures. Pathogenicity tests of the fungus were performed on potted S. obassia plants. Leaves were wounded with a sterilized needle and inoculated with mycelial agar. Development of necrotic zones was observed within 4 months. Numerous propagules appeared on the necrotic areas, and two strains of the same fungus were isolated again. The morphology of the pathogen was described, and its phylogeny was analysed based on the sequences of nuclear rDNA ITS, LSU regions and the rpb2 genes. Twenty‐four sequences were generated from six strains. Phylogenetic analyses indicated that the pathogen was closely related to the members of Mycosphaerellaceae, but was distinct in having brown propagules with hyphal appendages that collapsed at maturity and divided into part spores. Therefore, we propose Collapsimycopappus as a new genus to accommodate a single species, C. styracis.

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Phylogenetic revision of Petrakia and Seifertia (Melanommataceae, Pleosporales): new and rediscovered species from Europe and North America

2020

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The phylogenetic revision of the genera Petrakia and Seifertia using LSU, ITS, RPB2 and TEF1 sequences and the re-evaluation of their morphological characteristics lead to several reclassifications: The genus Pseudodidymella as well as the genera Mycodidymella and Xenostigmina are synonymized with the genus Petrakia. Based on ITS sequence comparisons, it was previously suspected that the leaf spot pathogen Pseudodidymella fagi, which occurs on the Japanese beech Fagus crenata in Japan, is conspecific to the pathogen attacking the European beech Fagus sylvatica in Switzerland and Germany since 2008.Herein, we show that Japanese and European collections represent separate species and describe the European one as Petrakia liobae new to science. Apart from that, we make the new combinations Petrakia fagi and Petrakia minima. The names Petrakia aesculi and Petrakia aceris are validated. A sixty-year-old collection from Wisconsin USA, designated as Petrakia echinata on leaves of silver maple (Acer saccharinum), proved to be another species new to science and is described here as Petrakia greenei. Consequently, there is currently no evidence of the European P. echinata to occur in North America. In contrast, P. echinata was found to infect the North American big leaf maple (Acer macrophyllum) in Europe. Antromycopsis alpina, described in 1914, was rediscovered in the Swiss Alps from dry fruits of Rhododendron ferrugineum. It is combined in Seifertia as S. alpina, based on molecular Manuscript Click here to access/download;Manuscript;Beenken_et_al_MS_Petrakia_an Click here to view linked References

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Pseudodidymella fagi gen. et sp. nov. and Its Hyphomycete Anamorph Pycnopleiospora fagi gen. et sp. nov. on Fagus crenata in Japan

Cited by 8 publications

References 8 publications

Pseudodidymellaceaefam. nov.: Phylogenetic affiliations of mycopappus-like genera inDothideomycetes

Pseudodidymellaceaefam. nov.: Phylogenetic affiliations of mycopappus-like genera inDothideomycetes

Collapsimycopappus: A new leaf pathogen with mycopappus‐like propagules in Mycosphaerellaceae

Phylogenetic revision of Petrakia and Seifertia (Melanommataceae, Pleosporales): new and rediscovered species from Europe and North America

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