| Authors | (Sacc.) E.W. Mason 1927 |
|---|---|
| Strain | 15004 |
| Classification | Xylariales, Apiosporaceae, Nigrospora |
| Culture collection | BCRC FU31417 |
| Detection frequency | Low |
| Figure |  Fig. 1 5-day-old colony on PDA  Fig. 2 Nigrospora sphaerica. a–c, e. Conidiophores and conidia. d. Sporulation on OA. f. Conidia (Bars= 5 μm, unless otherwise specified) |
| Colonies | Colonies on PDA attaining >90-mm at 25 °C after 5 days, margins entire, sparse cottony, granular, reverse yellowish, turning black with age. |
| Conidiophores | Conidiophores mostly solitary, simple or branched, brown, often consisting of 1 to several swollen, globose or irregular cells. |
| Conidiogenous cells | Conidiogenous cells brown, terminal or intercalary, subglobose, cylindrical or irregular, bearing 1 conidia, sometimes with collarette, often becoming collapsed after conidia detached |
| Conidia | Conidia globose to subglobose, aseptate, brown to dark brown, (13–)15–19(–21) µm (avg. 17.6 µm) in diameter. |
| Note | The conidia of this species can be actively discharged. Therefore, this fungus is air-borne. This species is commonly found in air, soil, plant debris. It has been reported to be pathogenic to plants. |
| Pathogenicity | Most of them are saprophytic and are often found on rice seeds. Occasionally cause secondary infections only when plants are injured, which has little effect on rice production. Reported to cause minute leaf and grain spot (Mew & Gonzales, 2002; Ou, 1985). |
| Specimens examined | Taiwan, Ilan County, rice grains, Aug 2014, Jie-Hao Ou, 14148 Taiwan, Taitung County, rice grains (cultivar Taiken 2), Jan 2015, Jie-Hao Ou, 15004 |
| ITS | GCAAGCTACCCGGGACCTCGCGCCCCGGGGCGGCCCGCCGGCGGACAAACCAAAACTCTTGTTATCTTAGTTGATTATCTGAGTGTCTTATTTAATAAGTCAAAACTTTCAACAACGGATCTCTTGGTTCTGGCATCGATGAAGAACGCAGCGAAATGCGATAAGTAATGTGAATTGCAGAATTCAGTGAATCATCGAATCTTTGAACGCACATTGCGCCCATTAGTATTCTAGTGGGCATGCCTGTTCGAGCGTCATTTCAACCCCTAAGCACAGCTTATTGTTGGGAACCTACGGCTTCGTAGTTCCTCAAAGACATTGGCGGAGTGGCAGTGGTCCTCTGAGCGTAGTAATCTTTTATCTCGCTTCTGTTAGGTGCTGCCCCCCCGGCCGTAAAACCCCCAATTTTTTCTGGTTGACCTCGGATCAGGTAGGAATACCCGCTGAACTTAA |