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Stemphylium amaranthi (IRAN 2601C). a-b. colonies on PDA (a) and PCA (b) after seven days; c-f. conidiophores and conidia; g. mature ascocarp; h-i. asci; k-l, ascospores.
Source publication
Stemphylium amaranthi was originally described from the leaves of Amaranthus retroflexous in China based only on asexual morphological characteristics. New collections of S. amaranthi from wheat and barley plants with symptoms of black (sooty) head mould in Golestan and Qazvin Provinces, Iran, revealed abundant formation of a sexual morph. The morp...
Contexts in source publication
Context 1
... in the original description of S. amaranthi (Pei et al. 2009). Stemphylium amaranthi is a new record for the mycobiota of Iran. We present an emended description for S. amaranthi based on Iranian collections. Colonies on PDA (7 days, in darkness at 24±1 °C) were floccose, 68 mm diam., pale brown to grey at center and creamy to white at margin (Fig. 2a); on PCA (7 days, white fluorescent light, 24±1 °C) were smooth, 64 mm diam., olive to dark green with distinct concentric zones of growth and sporulation (Fig. 2b). Sporulation was abundant from aerial mycelia and less from submerged mycelia. Hyphae were pale brown, septate, branched, 4-5 μm wide. Conidiophores were pale brown, ...
Context 2
... for S. amaranthi based on Iranian collections. Colonies on PDA (7 days, in darkness at 24±1 °C) were floccose, 68 mm diam., pale brown to grey at center and creamy to white at margin (Fig. 2a); on PCA (7 days, white fluorescent light, 24±1 °C) were smooth, 64 mm diam., olive to dark green with distinct concentric zones of growth and sporulation (Fig. 2b). Sporulation was abundant from aerial mycelia and less from submerged mycelia. Hyphae were pale brown, septate, branched, 4-5 μm wide. Conidiophores were pale brown, straight or somewhat curved, up to 200 μm in length. Conidiogenous cells were swollen at the apex, occasionally with 1-5 apical proliferation, pale brown and 5.5-6.5 μm ...
Context 3
... cylindrical, bottle shaped, conical or obclavate, rounded at the base and spherical to conical at the apex, sometimes with a short apical extension, usually with 1-7(-9) transverse septa, 1-5 longitudinal septa, 1-4 oblique septa, distinctly constricted at the median septum and 21-57 × 10-18 μm (av. 35.28 × 14.62 μm; L/W= 1.43-3.8) (Fig. 2c-f). Sexual morph was firstly formed on PCA plates incubated at 4 °C after 1 month and was fully developed after 2-3 months. Ascomata were dark brown, thick-walled, spherical, 300-700 × 250-550 μm (Fig. 2g). Asci were bitunicate, hyaline, 8-spored, 300-350 × 35-37.5 μm (Fig. 2h-j). Ascospores were pale to dark brown, with even darkened ...
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... longitudinal septa, 1-4 oblique septa, distinctly constricted at the median septum and 21-57 × 10-18 μm (av. 35.28 × 14.62 μm; L/W= 1.43-3.8) (Fig. 2c-f). Sexual morph was firstly formed on PCA plates incubated at 4 °C after 1 month and was fully developed after 2-3 months. Ascomata were dark brown, thick-walled, spherical, 300-700 × 250-550 μm (Fig. 2g). Asci were bitunicate, hyaline, 8-spored, 300-350 × 35-37.5 μm (Fig. 2h-j). Ascospores were pale to dark brown, with even darkened septa, oblong-spherical, rounded at both ends, with 6-7 transverse septa, 6-7 longitudinal septa, and 34-41 × 14-18 μm (av. 37.44 × 16.83 μm; L/W= 2.11-3.45) (Fig. 2k-l). Specimens examined-IRAN. Golestan ...
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... septum and 21-57 × 10-18 μm (av. 35.28 × 14.62 μm; L/W= 1.43-3.8) (Fig. 2c-f). Sexual morph was firstly formed on PCA plates incubated at 4 °C after 1 month and was fully developed after 2-3 months. Ascomata were dark brown, thick-walled, spherical, 300-700 × 250-550 μm (Fig. 2g). Asci were bitunicate, hyaline, 8-spored, 300-350 × 35-37.5 μm (Fig. 2h-j). Ascospores were pale to dark brown, with even darkened septa, oblong-spherical, rounded at both ends, with 6-7 transverse septa, 6-7 longitudinal septa, and 34-41 × 14-18 μm (av. 37.44 × 16.83 μm; L/W= 2.11-3.45) (Fig. 2k-l). Specimens examined-IRAN. Golestan Province: Bandar-e Torkaman, on wheat head, May 2014, IRAN 2601C (ITS ...
Context 6
... thick-walled, spherical, 300-700 × 250-550 μm (Fig. 2g). Asci were bitunicate, hyaline, 8-spored, 300-350 × 35-37.5 μm (Fig. 2h-j). Ascospores were pale to dark brown, with even darkened septa, oblong-spherical, rounded at both ends, with 6-7 transverse septa, 6-7 longitudinal septa, and 34-41 × 14-18 μm (av. 37.44 × 16.83 μm; L/W= 2.11-3.45) (Fig. 2k-l). Specimens examined-IRAN. Golestan Province: Bandar-e Torkaman, on wheat head, May 2014, IRAN 2601C (ITS MG397180, GAPDH MG397170); Golestan Province, Gonbad-e Kavous, on barley head, May 2014, IRAN 2603C (ITS MG397183, GAPDH MG397169); Golestan Province, Gorgan, on wheat head, May 2014, ABRII 10289 (ITS MG397181, GAPDH MG397171); ...
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