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.

Index Fungorum, FacesoffungiMycoBankGenBank: Fig. 1

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, tef1α 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. 2017Hyde 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.



Crous PW, Wingfield MJ, Schumacher RK, Akulov A et al. 2020  New and interesting fungi 3. Fungal Systematics and Evolution 6, 157231.

Crous PW, Schumacher RK, Akulov A, Thangavel R et al. 2019  New and interesting fungi 2. Fungal Systematics and Evolution 3, 57–134.

Dai DQ, Phookamsak R, Wijayawardene NN, Li WJ et al. 2017  Bambusicolous fungi. Fungal Diversity 82, 1105.

Hyde KD, Chaiwan N, Norphanphoun C, Boonmee S et al. 2018  Mycosphere notes 169–224. Mycosphere 9, 271430.

Phookamsak R, Hyde KD, Jeewon R, Bhat JD et al. 2019  Fungal diversity notes 929–1035: taxonomic and phylogenetic contributions on genera and species of fungi. Fungal Diversity 95, 1–273.

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, 1236.


Entry by

Phukhamsakda C., Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai, Thailand


(Edited by Kevin D. Hyde)