Pleosporales » Pleosporales, genus incertae sedis

Parameliola

Parameliola Hongsanan, Peršoh & K.D. Hyde, in Li et al., Fungal Diversity 78: 10.1007/s13225-016-0366-9, [66] (2016).

 Index Fungorum number: IF 551765; Facesoffungi number: FoF 01664, 1 morphological species (Species Fungorum 2022), 1 species with molecular data.

Hyperparasitic on the surface of hyphae of Meliola thailandicum. On superficial hyphae of M. thailandicum, growing on the lower surface of living leaves, branched, septate, darker at the septum, brown to dark brown, with hyphopodia, later forming outwardly radiating black colonies with capitate hyphopodia, mostly alternate or sometimes opposite on hyphae, near to hyphal septum, 2-celled, brown and hyphal setae 5 μm diam., aseptate, brown to reddish brown, pale brown to hyaline at the apex. Sexual morph: Unknown. Asexual morph: Conidiomata of Parameliola superficial, solitary, globose to subglobose, attached to the superficial hyphae of Meliola thailandicum, ostiole absent, thin-walled, brown to dark brown. Peridium comprising 2 layers of textura angularis, inner layer very thin and hyaline, outer layer dark brown. Hamathecium lacking pseudoparaphyses. Conidiophores not observed. Conidiogenous cells holoblastic in cavity of conidiomata, cylindrical, hyaline, smooth-walled. Conidia borne singly at the apex of the conidiophore, ellipsoid to cylindrical, both ends broadly rounded, aseptate, hyaline, smooth-walled (adapted from Li et al. 2016).

Type species: Parameliola dimocarpi Hongsanan & K.D. Hyde

Notes: Parameliola resembles Coniothyrium in having globose, black conidiomata and unicellular hyaline conidia. Parameliola differs from Coniothyrium and other genera in Pleosporales in being hyperparasitic on the thallus or hyphae of Meliola species. In the phylogenetic analysis of Li et al. (2016), Parameliola does not cluster in any family of Pleosporales hence was placed in Pleosporales genera incertae sedis. The taxonomic placement of Parameliola is still uncertain and more collections are needed to establish the correct placement of Parameliola. Only LSU sequence is available for a Parameliola sp (SH-2016).

 

 

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