Fungalpedia – Note 104 Pararoussoella
Pararoussoella Wanas., E.B.G. Jones & K.D. Hyde
Citation when using this entry: Phukhamsakda et al., in prep – Fungalpedia, marine fungi. Mycosphere.
Pararoussoella was introduced as a monotypic genus, typified by Pararoussoella rosarum Wanas., E.B.G. Jones & K.D. Hyde (Wanasinghe et al. 2018). The genus is distinct from other roussoella-like taxa in having a minute, visible ostiole on the host surface, solitary, immersed, subglobose to ampulliform ascomata, papillate, cellular pseudoparaphyses, uniseriate, broad cylindrical asci, and dark brown, ellipsoidal, 1-septate ascospores, with longitudinal striations. The asexual morph was reported based on P. juglandicola as a coelomycete, characterized by globose, brown, pycnidial conidiomata, phialidic conidiogenous cells and hyaline to brown, subcylindrical, aseptate, guttulate conidia (Crous et al. 2019). Pararoussoella was classified within Thyridariaceae (Dothideomycetes, Pleosporales) and with extensive taxon sampling, Phookamsak et al. (2019) transferred this genus to Roussoellaceae based on a polyphasic approach. Molecular markers for a robust insight into the species identification requires LSU, SSU, ITS, tef1–α and rpb2 gene (Wanasinghe et al. 2018). Pararoussoella is highly diverse in terms of host associations. The type species was introduced from Rosa species from the UK (Wanasinghe et al. 2018), Juglans regia from Germany (Crous et al. 2019), Quercus robur from Ukraine (Crous et al. 2020), bamboo and submerged Rhizophora from Thailand (Dai et al. 2017, Hyde et al. 2018). Pararoussoella mukdahanensis and P. mangrovei were classified as Roussoella members, however, they are classified as Pararoussoella based on multigene phylogenetic analysis.
Type species: Pararoussoella rosarum Wanas., E.B.G. Jones & K.D. Hyde
Other accepted species:
Pararoussoella juglandicola Crous & R.K. Schumach.
Pararoussoella mangrovei (Phukhams. & K.D. Hyde) Phukhams. & K.D. Hyde
Pararoussoella mukdahanensis (Phook., D.Q. Dai & K.D. Hyde) Crous
Pararoussoella quercina Crous & Akulov
Pararoussoella rosarum Wanas., E.B.G. Jones & K.D. Hyde
Figure 1 – Pararoussoella mangrovei (MFLU 17–1542, holotype). a Appearance of ascomata on Rhizophora species. b Vertical section through ascoma. c Ostiolar canal. d Vertical section through peridium. e Pseudoparaphyses. f-i Asci. j-p Ascospores. Scale bars: a, b = 500 µm, c = 200 µm, d-i = 50 µm, j-p =10 µm.
Wanasinghe DN, Phukhamsakda C, Hyde KD, Jeewon R et al. 2018 – Fungal diversity notes 709–839: taxonomic and phylogenetic contributions to fungal taxa with an emphasis on fungi on Rosaceae. Fungal Diversity 89, 1–236.
Phukhamsakda C., Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai, Thailand
(Edited by Kevin D. Hyde)