1. In aquatic habits generally ……………………………….……….…………….……………….. 2
1’. In terrestrial habits generally; ascospore fusiform ………………………………………….… 3
2. Ascomata dark brown to black, with a single ascus discharged through the ascomatal neck
……………………………………………………………………………………….. Ophioceras (Type genus)
2’. Ascomata yellow to brown, membranous, with ascospores amassing at the ascomatal neck
…………………………………………………………………………………………………. Pseudohalonectria
3. Ascomata immersed, solitary or in small groups ………………………………………………..
……………………………………………………………………………………………………………………………. 4
3’. Ascomata superficial, gregarious in large clusters with a basal stroma, dark brown ……….
…………………………………………………………………………………………………….. Ceratosphaerella
4. Ascomata yellow brown; ascospores fusiform; on wood ………………..… Ceratosphaeria
4’. Ascomata dark brown; ascospores filiform; on dead leaves of Magnolia …..………………….
……………………………………………………………………………………………………….Tropohalonectria
Copyright 2022 by The American Phytopathological Society. Reproduced, by permission, from Luo, J., and Zhang, N. 2022. The Rice Blast Fungus and Allied Species: A Monograph of the Fungal Order Magnaporthales (https://my.apsnet.org/APSStore/Product-Detail.aspx?WebsiteKey=2661527A-8D44-496C-A730-8CFEB6239BE7&iProductCode=46826). American Phytopathological Society, St. Paul, MN.