Thelonectria

Zeng, Zhao-Qing & Zhuang, Wen-Ying, 2013, Four new taxa of Ilyonectria and Thelonectria (Nectriaceae) revealed by morphology and combined ITS and - tubulin sequence data, Phytotaxa 85 (1), pp. 15-25 : 23

Key to the known species of Thelonectria

1. Teleomorph unknown .................................................................................................... T. olida ( Chaverri et al. 2011)

- Teleomorph occurring on nature substrate .................................................................................................................. 2

2. Ascospores averaging ≤ 20 µm long ........................................................................................................................... 3

- Ascospores averaging> 20 µm long ......................................................................................................................... 11

3. Perithecial apex with a fringe of saccate cells ........................................... T. coronata ( Brayford and Samuels 1993)

- Perithecial apex not as above ...................................................................................................................................... 4

4. Perithecial wall three-layered ..................................................................................................................................... 5

- Perithecial wall two-layered ....................................................................................................................................... 7

5. Microconidia present, (8–)8.2–16(–16.5) × (3–)3.2–4.5(–4.8) µm ...................................... T. yunnanica (this paper)

- Microconidia absent .................................................................................................................................................... 6

6. Perithecia smooth to slightly roughened ................................................................. T. trachosa ( Brayford et al. 2004)

- Perithecia strongly warty ..................................................................................... T. viridispora ( Brayford et al. 2004)

7. Ascospores averaging ≥ 7 µm wide ........................................................ T. veuillotiana ( Brayford and Samuels 1993)

- Ascospores averaging <7 µm wide ............................................................................................................................. 8

8. Perithecia smooth, surface shining ............................................................................................................................. 9

- Perithecia rough or conspicuously warty .................................................................................................................. 10

9. Perithecial wall 30–50 µm; colonies purple on PDA ......................................... T. discophora ( Brayford et al. 2004)

- Perithecial wall 20–30 µm; colonies white to tan on PDA........................................... T. lucida ( Brayford et al. 2004)

10. Perithecial wall 22–38 µm thick; ascospores smooth; microconidia present ...................... T. beijingensis (this paper)

- Perithecial wall 32–55 µm thick; ascospores spinulose; microconidia absent ....... T. sinensis ( Luo and Zhuang 2010)

11. Perithecia smooth, surface shining; ascospores (15–)22–29(–36) × (5–) 8.5–10.2 µm .................................................. ................................................................................................................................... T. jungneri ( Brayford et al. 2004)

- Perithecia rough to warty, not shining if nearly smooth; ascospores (24–)25–34(–37) × (7–)8.5–11.5(–13) µm ......... ............................................................................................................................. T. westlandica ( Brayford et al. 2004)