Helicascus, Kohlmeyer, 1969

Zeng, Ming, Huang, Shi-Ke, Hyde, Kevin D. & Zhao, Qi, 2018, Helicascus alatus (Morosphaeriaceae), a new freshwater species from southwestern China, Phytotaxa 351 (3), pp. 210-218 : 215

Key to species of Helicascus

1. Ascospores with sheath......................................................................................................................................................................2

1. Ascospores without sheath.................................................................................................................................................................3

2. Ascomata unilocular...........................................................................................................................................................................4

2. Ascomata more than unilocular..........................................................................................................................................................5

3. Ascospores uniseriate.........................................................................................................................................................................6

3. Ascospores more than 1-seriate..........................................................................................................................................................7

4. Ascospores with smooth-walled............................................................................................................................................ H. alatus

4. Ascospores with verruculose..............................................................................................................................................................8

5. Ascospores uniseriate.........................................................................................................................................................................9

5. Ascospores more than 1-seriate........................................................................................................................................................10

6. Ascospores ellipsoid-fusiform with round ends 1 ................................................................................................................ H. gallicus

6. Ascospores obovoid with only one apiculate end 2 ......................................................................................................... H. mangrovei

7. Ascospores ellipsoid-fusiform, apical cell bigger than basal cell 3, 4 .................................................................................................11

7. Ascospores symmetrical 5 .......................................................................................................................................... H. thalassioideus

8. Ascospores hyaline when young, becoming brown when mature 3 ......................................................................... H. chiangraiensis

8. Ascospores pale greenish brown to brown 6 ................................................................................................................... H. elaterascus

9. Ascospores 30–55 × 17–25 μm 7 ................................................................................................................................... H. kanaloanus

9. Ascospores 25–35 × 12–15 μm 7 ............................................................................................................................................ H. nypae

10. Ascospore 27–35 × 8–14 μm 5 ....................................................................................................................................... H. aegyptiacus

10. Ascospore 19–26 × 8–11 μm 5 .......................................................................................................................................... H. aquaticus

11. Ascospores hyaline when young, becoming brown when mature 3 ............................................................................... H. uniseptatus

11. Ascospores pale olivaceous brown 4 ............................................................................................................................. H. unilocularis