Pleosporales » Pleosporomycetidae genus incertae sedis

Hysterographium

Hysterographium Corda, Icon. fung. (Prague) 5: 34, 77 (1842).

Index Fungorum number: IF 2468; Facesoffungi number: FoF 11845, 35 morphological species (Species Fungorum 2022), 3 species with molecular data.

Saprobic on host. Sexual morph: Hysterothecia gregarious, erumpent, superficial, straight to flexuous, irregular in shape especially when crowded, lips more or less open exposing a narrow disc; pseudoparaphyses hyaline, abundant, filiform, branched. Epithecium ferrugineous to red-brown. Asci cylindrical-claviform, (4−)8-spored Ascospores reddish brown, uniseriate to biseriate, muriform, appearance not parenchymatic, with 4-6 transverse and 1-longitudinal septum, ellipsoid, constricted at the median septum. Asexual morph: Unknown (adapted from Corda 1842, Lorenzo & Messuti 1998).

Type species: Hysterographium elongatum (Wahlenb.) Corda

Notes: Hysterographium is characterised by gregarious, erumpent, superficial hysterothecia, cylindrical-claviform, (4−)8-spored asci and reddish brown, uniseriate to biseriate, ellipsoid ascospores. Zogg (1962) revised Hysterographium and accepted four species, H. flexuosum, H. fraxini, H. mori and H. subrugosum. The pigmented dictyospores, produced in typical hysterothecia, that are erumpent or sessile on the substrate are a significant delineating character of Hysterographium (Boehm et al. 2009). Hysterographium was removed from Hysteriaceae and placed in Pleosporomycetidae genus incertae sedis (Boehm et al. 2009). Molecular markers available for Hysterobrevium mori are SSU, LSU, TEF-1; H. didymosporum (SSU, LSU, RPB2), H. flexuosum (TEF-1), H. fraxini (LSU, SSU, TEF-1), H. minus (ITS, LSU), H. pulchrum (ITS, SSU), H. subrugosum (RPB2) and H. vulvatum (LSU). Hysterographium may warrant familial rank. More taxa with DNA sequence data are required to confirm the correct taxonomic placement of the genus.

 

 

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