Fungalpedia – Note 3237, Exosporium

 

Exosporium Link, Mag. Gesell. naturf. Freunde, Berlin 3(1-2): 9 (1809).

Citation when using this data: Zhang SN et al. 2024 – Fungalpedia.

Index Fungorum, Faceoffungi, MycoBank, GenBank.

Classification: Incertae sedis, Incertae sedis, Incertae sedis, Incertae sedis, Pezizomycotina, Ascomycota, Fungi.

Notes: Exosporium is characterized by having a stroma that give rise to fasciculate conidiophores with sympodial proliferation, and obclavate, pale to brown, distoseptate conidia, usually with a truncate, darkened base (Ellis 1971). The genus is typified by E. tiliae, a collection from Tilia in Germany (Ellis 1961). Sequences of this type collection are not available. A strain deposited in Westerdijk Institute as E. tiliae (CBS 484.77, CBS H-713, Québec, Canada) was identified as Corynespora olivacea (Crous et al. 2011) and later designed as an epitype of Helminthosporium caespitosum by Voglmayr and Jacklitsch (2017), who synonymized the genus Exosporium under Helminthosporium. Nevertheless, Videira et al. (2017) considered Exosporium to be an independent genus in Mycosphaerellaceae because the unresolved phylogeny of its type species. There are 42 morphological species but only two of them have sequence data (Videira et al. 2017; Hongsanan et al. 2020a). Exosporium has been reported from palms, especially species of the fan palm Livistona. In the present study, a new Exosporium species isolated from Licuala palm is introduced.

Type species: Exosporium tiliae Link.

Other accepted species: Species Fungorum – search Exosporium.

 

References

Crous PW, Summerell BA, Shivas RG, Romberg M et al. 2011 – org Fungal Planet description sheets: 92–106. Persoonia 27:130–162. 

Ellis MB. 1971 – Dematiaceous Hyphomycetes. Commonwealth Mycological Institute, Kew, Surrey, England.

Hongsanan S, Hyde KD, Phookamsak R, Wanasinghe DN et al.  2020a – Refined families of Dothideomycetes: Dothideomycetidae and Pleosporomycetidae. Mycosphere 11(1): 1553–2107.

Videira SIR, Groenewald JZ, Nakashima C, Braun U et al. 2017 – Mycosphaerellaceae – chaos or clarity? Stud Mycol 87:257–421.

Videira SIR, Groenewald JZ, Nakashima C, Braun U et al. 2017 – Mycosphaerellaceae – chaos or clarity? Stud Mycol 87:257–421.

Voglmayr H, Jaklitsch WM. 2017 – Corynespora, Exosporium and Helminthosporium revisited – new species and generic reclassification. Stud Mycol 87:43–76.

 

Entry by

Sheng-Nan Zhang, School of Life Science and Technology, Center for Informational Biology, University of Electronic Science and Technology of China, Chengdu 611731, P.R. China., Department of Entomology and Plant Pathology, Faculty of Agriculture, Chiang Mai University, Chiang Mai 50200, Thailand., Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai 57100, Thailand.

 

Published online 18 September 2026

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