Fungalpedia – Note 176, Eutiarosporella

 

Eutiarosporella Crous

Citation when using this data: Huanraluek et al. 2024 (in prep) – Fungalpedia, coelomycetes. 

Index Fungorum, Facesoffungi, MycoBank, GenBank, Coleomycetes.org, Fig 1.

Classification: Botryosphaeriaceae, Botryosphaeriales, Incertae sedis, Dothideomycetes, Pezizomycotina, Ascomycota, Fungi.

Eutiarosporella was introduced by Crous et al. (2015) to accommodate E. tritici (B. Sutton & Marasas) Crous (Basionym: Tiarosporella tritici B. Sutton & Marasas) as the type species. Morphologically, this genus is similar to Tiarosporella Höhn. and is distinguished by the presence of conidiomata with having long necks and holoblastic conidiogensis (Li et al. 2016). This genus is established based on the recommended genetic markers at the genus level, which are LSU and SSU, and at the species level ITS and LSU (Li et al. 2016,  Jayawardena et al. 2019,  Li et al. 2020). The asexual morph of Eutiarosporella is characterized by pale brown to brown, stromatic, pycnidial conidiomata that are mostly epiphyllous, solitary to gregarious or often confluent, initially immersed, then becoming partly erumpent, globose to subglobose, unilocular, glabrous, and ostiolate. Conidiophores are reduced to conidiogenous cells. Conidiogenous cells line the inner cavity and are holoblastic, determinate, cylindrical, hyaline, and smooth-walled. Conidia are solitary, hyaline, smooth and thin-walled, straight, ovoid to fusoid, with obtuse apex and truncate base, with a cone-like mucoid apical appendage (Crous et al. 2015, Li et al. 2020). 

The sexual morph of Eutiarosporella was reported for the first time from E. dactylidis K.M. Thambugala, E. Camporesi & K.D. Hyde, which was reported in a saprobic mode on the stems of grasses (Avenella sp.). The sexual morph is characterized by black globose to subglobose, ostiolate ascomata on host tissue. Asci are bitunicate, 8-spored, fissitunicate, clavate to cylindric-clavate, pedicellate, and apically rounded, with an ocular chamber. Ascospores are 1-2-seriate in the upper half, uniseriate at the base, aseptate, ellipsoidal to fusiform, usually wider in the center, thick-walled, smooth-walled, surrounded by a mucilaginous sheath (Li et al. 2016). Eutiarosporella species are saprobic or parasitic on host plants in terrestrial habitats, such as Celtis africana (Cannabaceae), Dactylis glomerata (Poaceae), Triticum aestivum (Poaceae), and Vachellia karro (Fabaceae), and have been found in Australia, Italy, and South Africa (Crous et al. 2015, Thynne et al. 2015, Dissanayake et al. 2016, Li et al. 2016, Li et al. 2020). There are seven species listed in Index Fungorum (2023) under Eutiarosporella 

            Type species: Eutiarosporella tritici (B. Sutton & Marasas) Crous 2015

Other accepted species: (Species Fungorum – search Eutiarosporella)

 

Figure 1 – Eutiarosporella tritici a–c Vertical section of conidiomata. d Section of peridium. e Conidiogenous cells and developing conidia. f Conidia. Scale bars: a, b = 200 µm, c = 100 µm, d = 50 µm, e = 10 µm, f =10 µm. Redrawn from Li et al. (2020).

 

References

Crous PW, Müller MM, Sánchez RM, Giordano L et al. 2015 – Resolving Tiarosporella spp. allied to Botryosphaeriaceae and Phacidiaceae. Phatotaxa 202, 73–93.

Dissanayake AJ, Phillips AJL, Li XH, Hyde KD 2016 – Botryosphaeriaceae: current status of genera and species. Mycosphere 7, 1001–1073.  

Jayawardena RS, Hyde KD, McKenzie EHC, Jeewon R et al. 2019 – One stop shop III: taxonomic update with molecular phylogeny for important phytopathogenic genera. Fungal Diversity 51–75. https://doi.org/10.1007/s13225-019-00433-6

Li GJ, Hyde KD, Zhao RL, Hongsanan S et al. 2016 – Fungal diversity notes 253–366: taxonomic and phylogenetic contributions to fungal taxa. Fungal Diversity 78, 1–237.https://doi.org/10.1007/s13225-016-0366-9

Li WJ, McKenZie EHC, Liu JK, Bhat DJ et al. 2020 – Taxonomy and phylogeny of hyaline-spored coelomycetes. Fungal Diversity 100, 279–801. https://link.springer.com/article/10.1007/s13225-020-00440-y

Thynne E, Mcdonald MC, Evans M, Wallwork H et al. 2015 – Re-classifcation of the causal agent of white grain disorder on wheat as three separate species of Eutiarosporella. Australas Plant Pathol 44, 527–539.   https://doi.org/10.1007/s13313-015-0367-2

 

 

Entry by

Naruemon Huanraluek, Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai, Thailand.

 

(Edited by Kevin D Hyde, Ruvishika S. Jayawardena, Samaneh Chaharmiri-Dokhaharani, & Achala R. Rathnayaka)

 

Published online 10 January 2024

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