Didymellaceae Gruyter, Aveskamp & Verkley, Mycol. Res. 113(4): 516 (2009), MycoBank: MB 508292
Parasites or saprobes on wood and dead herbaceous stems or leaves. Sexual state: Ascomata pseudothecia, separate or gregarious, or scattered, immersed, erumpent, or rarely superficial, brown to black, ostiole central. Peridium relatively thin, composed of 2–3 cell layers of textura angularis . Hamathecium lacking pseudoparaphyses. Asci 8-spored, bitunicate, fissitunicate, cylindric-clavate to clavate, shortpedicellate or apedicellate, with an ocular chamber. Ascospores overlapping uni-seriate or bi-seriate, upper cell wider than lower cell, hyaline 1-septate, constricted at the septum, smooth-walled, asymmetrical. Asexual states: coelomycetous. Conidiomata pycnidial, immersed, or semiimmersed, sometimes becoming erumpent, uni-locular, pale to medium brown, globose, thin or thick-walled, peridium with cells of textura angularis . Ostiole central, circular, papillate or not. Conidiophores mostly absent, only present in Phoma cava Schulzer and P. tracheiphila Petri) L.A. Kantsch. & Gikaschvili and then either filiform, septate, and branched, or short, irregularly branched, and ramified respectively. Conidiogenous cells enteroblastic, phialidic, doliiform to lageniform, ampulliform or cylindrical, hyaline, thin walled, smooth-walled. Conidia hyaline or pale brown, septate or aseptate, thin-walled, guttulate, ellipsoid, cylindrical, fusiform, pyriform or globose.

Species

  • Type : Didymella Sacc., Michelia 2(no. 6): 57 (1880), MycoBank MB1548

Key to sexual genera of Didymellaceae

1. Ascospores muriform …………………………Leptosphaerulina
1. Ascospores 2-celled, rarely 3- to 4-celled …………………….2
2. Ascospores constricted at the central septum ………………..3
2. Ascospores septate near the lower end …………..Platychora
3. Ascospores narrowly inequilateral …………Monascostroma
3. Ascospores ovoid to ellipsoidal ……………………………………4
4. Ascomata with hairs or setae ………………….Macroventuria
4. Ascomata without hairs or setae …………………….Didymella
Key to asexual genera of Didymellaceae
1. Coelomycetous asexual states ……………………………………..2
1. Hyphomycetous asexual states …………………………………….8
2. Pycnidia having dark brown setae, verrucose, conidia ellipsoid
……………………………………………………………………………..3
2. Pycnidia lacking setae ………………………………………………..4
3. Conidiophores hyaline to sub hyaline, ampulliform to
lageniform ……………………………………………….Dactuliochaeta
3. Conidiophores hyaline, doliiform to ampulliform
………………………………………………………………..Chaetasbolisia
4. Conidiophores present …………………………………….Piggotia
4. Conidiophores absent …………………………………………………5

5. Conidia brown, globose, pyriform, cylindrical or ellipsoid
……………………………………………………………Microsphaeropsis
5. Conidia hyaline …………………………………………………………6
6. Conidiogenous cells doliiform to lageniform, hyaline, conidia
hyaline, cylindrical to irregular ………………….Ascochyta
6. Conidiogenous cells ampulliform to doliiform ………………7
7. Conidia ellipsoid, cylindrical fusiform, pyriform or globose,
often guttulate ………………………………………………………Phoma
7. Conidia irregular shape, large conidia (15×5 μm),1(−2)-
septate …………………………………………………………….Boeremia
8. Dark sporodochia, with branched (sub) hyaline conidiophores
…………………………………………………………..Epicoccum
8. Conidiophores brown, denticles …………………..Pithomyces