Endosporiaceae D. Pem, Doilom & K.D. Hyde, fam. nov.

Index Fungorum number: IF557066; Facesoffungi number: FoF 06681

Pathogenic on bud of Populus tremuloides. Sexual morph: Undetermined. Asexual morph: Colonies (conidiomata) on PDA, OA and CA black, raised, cerebriform, comprising numerous cellular clumps in a thin glop covering, subcircular to irregular in outline, reverse black. Margin irregular with scarce, occasionally aggregated hyphae on PDA, even with adpressed or submerged hyphae on MEA. On PDA, cells more broad, swollen, subhyaline and dumbbell-shaped when two-celled, becoming multicellular by splitting in all directions, turning darkly pigmented, irregular in shape, frequently separating into smaller clumps. Hyphae cylindric-shaped or toruloid, light to dark brown, branched or unbranched, aerial ones determinate in growth, mostly elongated, hyaline at apex, forming muriform and darkly pigmented bodies. Endoconidia developing from the separation of adjacent daughter cells in cellular clumps through septum schizolysis, unicellular, hyaline, ellipsoidal to subglobose turning broadly ellipsoidal to globose. Blastic conidia abundant in mature colonies, arising from cells of cellular clumps or seldom from sides of hyphae, unicellular, hyaline or light brown, cylindrical to ellipsoidal, regularly truncate at the base, sometimes globose, obovoid, fusiform.

Family type – Endosporium Tsuneda

Notes – The family Endosporiaceae is introduced to accommodate the genus Endosporium typified by E. populi-tremuloides. Endosporiaceae is characterized by cylindric-shaped hyphae, ellipsoidal, subglobose to globose endoconida and cellular clumps, globose, obovoid, fusiform blastic conidia. The family Endosporiaceae is distinct from other families in the Dothideomycetes in having endoconidia forming as cellular clumps through septum schizolysis and blastic hyaline or light brown conidia. Further studies may aim to link asexual morphs of species in this family to their sexual counterparts.


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