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Homortomyces gen. nov., a new dothidealean pycnidial fungus from the Cradle of Humankind.

Crous PW, Groenewald JZ, Lombard L, Wingfield MJ - IMA Fungus (2012)

Bottom Line: Based on its transversely septate, brown conidia, the presence of paraphyses, and percurrent proliferation of the conidiogenous cells, the genus resembles Stilbospora (Melanoconidaceae, Diaporthales).It is distinct in having pycnidial condiomata, conidia lacking mucoid sheaths, and becoming muriform when mature.Its morphology and phylogenetic placement based on analyses of sequence data for the large subunit nuclear ribosomal RNA gene (LSU, 28S) as well as the ITS and 5.8S rRNA gene of the nrDNA operon, show that Homortomyces represents a novel genus in Dothideomycetes, although its familial relationships remain unresolved.

View Article: PubMed Central - PubMed

Affiliation: CBS-KNAW Fungal Biodiversity Centre, Uppsalalaan 8, 3584 CT Utrecht, The Netherlands;

ABSTRACT
Homortomyces is introduced as a new coelomycetous genus associated with leaf spots onCombretum erythrophyllum trees growing near and around the Sterkfontein caves, Maropeng, South Africa. Based on its transversely septate, brown conidia, the presence of paraphyses, and percurrent proliferation of the conidiogenous cells, the genus resembles Stilbospora (Melanoconidaceae, Diaporthales). It is distinct in having pycnidial condiomata, conidia lacking mucoid sheaths, and becoming muriform when mature. Its morphology and phylogenetic placement based on analyses of sequence data for the large subunit nuclear ribosomal RNA gene (LSU, 28S) as well as the ITS and 5.8S rRNA gene of the nrDNA operon, show that Homortomyces represents a novel genus in Dothideomycetes, although its familial relationships remain unresolved.

No MeSH data available.


Related in: MedlinePlus

Homortomyces combreti (CPC 19800). A. Rocky Highveld Grassland at Sterkfontein Caves, Maropeng. B–D. Prominent leaf spots on Combretum erythrophyllum, with black pycnidia. E. Sporulating pycnidial conidiomata on MEA. F. Paraphyses. G–J. Conidiogenous cells giving rise to conidia. K–P. Distoseptate conidia, showing septal pores, transverse septa, and flattened, eccentric, basal conidial hila. Scale bars = 10 μm.
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Figure 2: Homortomyces combreti (CPC 19800). A. Rocky Highveld Grassland at Sterkfontein Caves, Maropeng. B–D. Prominent leaf spots on Combretum erythrophyllum, with black pycnidia. E. Sporulating pycnidial conidiomata on MEA. F. Paraphyses. G–J. Conidiogenous cells giving rise to conidia. K–P. Distoseptate conidia, showing septal pores, transverse septa, and flattened, eccentric, basal conidial hila. Scale bars = 10 μm.

Mentions: (Fig. 2)


Homortomyces gen. nov., a new dothidealean pycnidial fungus from the Cradle of Humankind.

Crous PW, Groenewald JZ, Lombard L, Wingfield MJ - IMA Fungus (2012)

Homortomyces combreti (CPC 19800). A. Rocky Highveld Grassland at Sterkfontein Caves, Maropeng. B–D. Prominent leaf spots on Combretum erythrophyllum, with black pycnidia. E. Sporulating pycnidial conidiomata on MEA. F. Paraphyses. G–J. Conidiogenous cells giving rise to conidia. K–P. Distoseptate conidia, showing septal pores, transverse septa, and flattened, eccentric, basal conidial hila. Scale bars = 10 μm.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3539313&req=5

Figure 2: Homortomyces combreti (CPC 19800). A. Rocky Highveld Grassland at Sterkfontein Caves, Maropeng. B–D. Prominent leaf spots on Combretum erythrophyllum, with black pycnidia. E. Sporulating pycnidial conidiomata on MEA. F. Paraphyses. G–J. Conidiogenous cells giving rise to conidia. K–P. Distoseptate conidia, showing septal pores, transverse septa, and flattened, eccentric, basal conidial hila. Scale bars = 10 μm.
Mentions: (Fig. 2)

Bottom Line: Based on its transversely septate, brown conidia, the presence of paraphyses, and percurrent proliferation of the conidiogenous cells, the genus resembles Stilbospora (Melanoconidaceae, Diaporthales).It is distinct in having pycnidial condiomata, conidia lacking mucoid sheaths, and becoming muriform when mature.Its morphology and phylogenetic placement based on analyses of sequence data for the large subunit nuclear ribosomal RNA gene (LSU, 28S) as well as the ITS and 5.8S rRNA gene of the nrDNA operon, show that Homortomyces represents a novel genus in Dothideomycetes, although its familial relationships remain unresolved.

View Article: PubMed Central - PubMed

Affiliation: CBS-KNAW Fungal Biodiversity Centre, Uppsalalaan 8, 3584 CT Utrecht, The Netherlands;

ABSTRACT
Homortomyces is introduced as a new coelomycetous genus associated with leaf spots onCombretum erythrophyllum trees growing near and around the Sterkfontein caves, Maropeng, South Africa. Based on its transversely septate, brown conidia, the presence of paraphyses, and percurrent proliferation of the conidiogenous cells, the genus resembles Stilbospora (Melanoconidaceae, Diaporthales). It is distinct in having pycnidial condiomata, conidia lacking mucoid sheaths, and becoming muriform when mature. Its morphology and phylogenetic placement based on analyses of sequence data for the large subunit nuclear ribosomal RNA gene (LSU, 28S) as well as the ITS and 5.8S rRNA gene of the nrDNA operon, show that Homortomyces represents a novel genus in Dothideomycetes, although its familial relationships remain unresolved.

No MeSH data available.


Related in: MedlinePlus