Dothistroma Hulbary, Bull. Ill. nat. Hist. Surv. 21: 235 (1941).
Associated with leaf spot. Sexual morph: Unknown. Asexual morph: Mycelium immersed, branched, septate, pale brown to hyaline. Conidiomata sometimes acervular, initially subepidermal later erumpent, composed of pale brown, thin-walled textura angularis, sometimes eustromatic, multilocular and of darker brown, thick-walled tissue. Dehiscence irregular, stromata strongly erumpent and finally pulvinate. Conidiophores absent. Conidiogenous cells holoblastic, discrete, determinate, ampulliform, hyaline, smooth, non-proliferating, formed from the upper cells of stroma or from inner cells of the locular walls. Conidia acrogenous, solitary, hyaline, straight or curved, filiform, 1–5-euseptate, continuous, thin-walled, smooth (adapted from Sutton 1980; Videira et al. 2017).
Type species: Dothistroma pini Hulbary
Notes: Dothistroma is characterised by pale brown to hyaline mycelium, acervular conidiomata, holoblastic conidiogeneous cells, and acrogenous, solitary, hyaline conidia. The type of Dothistroma pini was found from Pinus nigra in the United States and an epitype has lately been designated by Barnes et al. (2016). Dothistroma is a well-supported genus in Mycosphaerellaceae. Molecular markers available for Dothistroma are ITS, BTUB, TEF-1 and RPB2.