Setoseptoria, Quaedvl., Verkley & Crous, 2013

Shu, Yongxin, Senanayake, Indunil C., Boonmee, Saranyaphat, Doilom, Mingkwan, Dong, Zhangyong & Dong, Wei, 2024, Introduction of a novel freshwater species Setoseptoria guangxiensis sp. nov., with Setoseptoria baiyunensis nom. nov., in Lentitheciaceae, Pleosporales, Phytotaxa 645 (2), pp. 120-130 : 127

Key to the sexual morph species of Setoseptoria

1. Ascomata multi-loculate.....................................................................................................................................................................2

1. Ascomata uni-loculate........................................................................................................................................................................3

2. Peridium thicker, 20–30 µm wide; ascomata with a slit-like opening .................................................................................... S. scirpi

2. Peridium thinner, 8–15 µm wide; ascomata lack a slit-like opening........................................................................... S. arundinacea

3. Ascospores 3-septate at maturity........................................................................................................................................................4

3. Ascospores 1-septate at maturity........................................................................................................................................................5

4. Ascomata with a highly melanized, large clypeus ........................................................................................................ S. baiyunensis

4. Ascomata lack a prominent clypeus ................................................................................................................................ S. bambusae

5. Ascospores not obviously constricted in apical cell.......................................................................................... S. magniarundinacea

5. Ascospores constricted in apical cell..................................................................................................................................................6

6. Asci longer, 90–130 µm long .............................................................................................................................................................7

6. Asci shorter, 50–85 µm long ..............................................................................................................................................................8

7. Ascomata with a small pore-like, depressed opening, apapillate................................................................................ S. arundelensis

7. Ascomata with a protruding, prominent, short papilla ................................................................................................ S. guangxiensis

8. Ascospores smaller, 25–30 × 4–5 µm ......................................................................................................................... S. englandensis

8. Ascospores larger, 30–35 × 5–7 µm ...................................................................................................................... S. lulworthcovensis