Mycosphaerellales » Mycosphaerellaceae


Dictyosporina L.M. Abreu, R.F. Castañeda & O.L. Pereira, in Hyde et al., Fungal Diversity 87: 63 (2017).

Index Fungorum number: IF 821781; Facesoffungi number: FoF 03438, 1 morphological species (Species Fungorum 2022), 1 species with molecular data.

Pathogen associated with leaf spot of Kielmeyera coriacea. Leaf spots epiphyllous, circular to irregular, single, black, with the presence of sporodochia. Internal mycelium indistinct. External mycelium absent. Sexual morph: Unknown. Asexual morph: Sporodochia reddish-brown. Conidiophores reduced to conidiogenous cells. Conidiogenous cells monoblastic, terminal integrated, determinate, annellidic, reddish-brown. Initially, almost the outer wall layer(s) breaks, and numerous conidia are observed attached only by the inner wall layer(s) and tiny portion of the outer wall layer(s). The conidiogenous cells apex just below each attached conidium has a pale or colorless pigmentation and a ridge of outer wall material some distance from the truncate base of the conidium observed at the conidiogenous loci. Conidia solitary, muriform, cylindrical rounded at the ends, reddish-brown and the secession of each conidium is schizolytic, but the outer and inner wall layers do not separate concurrently (adapted from Hyde et al. 2017).


Type species: Dictyosporina ferruginea Abreu, R.F. Castañeda & O.L. Pereira


Notes: Dictyosporina is characterised by epiphyllous, circular to irregular leaf spots, and reddish-brown sporodochia. Dictyosporina resembles genera such as Dictyorostrella, Stigmina, Thyrostroma, Thyrostromella and Xenostigmina in having morphologically similar sporodochia and conidia. Dictyorostrella differs from Dictyosporina in having a conspicuous, immersed, or erumpent, dark brown stromata and monoblastic, indeterminate, annellidic conidiogenous cells with euseptate, obclavate, abruptly rostrate, obconical conidia, truncate at the base (Braun 1999). Stigmina differs from Dictyosporina in having a well-developed, immersed or superficial, brown stroma and monoblastic, indeterminate, annellidic conidiogenous cells with distoseptate, euseptate, clavate, obclavate or oblong conidia (Ellis 1971; Sutton and Pascoe 1989). Thyrostroma differs from Dictyosporina in having superficial and immersed, pale brown stromata, monoblastic, indeterminate, annellidic conidiogenous cells with 1–3 enteroblastic percurrent elongations, with ellipsoidal, cylindrical, pale to mid brown conidia (Ellis 1971; Seifert et al. 2011). Thyrostromella differs from Dictyosporina in having erumpent stromata, and polyblastic, indeterminate, with few sympodial elongations and cicatrized conidiogenous cells with euseptate, dictyoseptate, brown to olivaceous brown conidia (Ellis 1971; Seifert et al. 2011). Xenostigmina can be distinguished from Dictyosporina in having terminal and intercalary, tapering to flat tipped loci, with sympodial and enteroblastic percurrent elongations conidiogenous cells with ellipsoidal to navicular conidia (Crous et al. 2009). Dictyosporina is a distinct and well-supported genus in Mycosphaerellaceae. Only LSU sequence data is available for one species, D. ferruginea.


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