Fungalpedia – Note 222, Nothoseiridium

 

Nothoseiridium Crous.

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

Citation when using this entry: Li et al. 2024 (in prep) – Fungalpedia, Xylariomycetidae. 

Classification: Sporocadaceae, Amphisphaeriales, Xylariomycetidae, Sordariomycetes, Pezizomycotina, Ascomycota, Fungi.

Nothoseiridium was established by Crous et al. (2020), based on morphology and phylogenetic analyses of combined ITS, LSU, rpb2, tef1, and tub2 sequence data. The type species, N. podocarpi was found on leaf spots of Podocarpus latifolius (Podocarpaceae), a plant pathogen in the Western Cape Province of South Africa. Nothoseiridium is characterized by black, round, acervular, flattened conidiomata, with a brown textura epidermoidea wall. Conidiophores reduced to conidiogenous cells, arising from basal layers of stroma, hyaline, smooth, subcylindrical to ampulliform, and annellidic. Conidia are fusoid, slightly curved, guttulate, pale brown, smooth-walled, with unequally 4-euseptate. The basal cells are hyaline and obconic with a truncate hilum, the median cells are pale brown, and the apical cells are hyaline and obtuse with filiform, flexuous, unbranched, excentric appendages (Crous et al. 2020). Nothoseiridium podocarpi is phylogenetically related to Seiridium and Nonappendiculata, but differs in having 4-septate, fusoid conidia with unbranched, excentric appendages and lack of sexual morphology (Liu et al. 2019, Crous et al. 2020). This genus is monotypic (Species Fungorum 2024).

Type species: Nothoseiridium podocarpi Crous.

Figure 1 – Nothoseiridium podocarpi (CBS H-24362, holotype). a Leaf spot on Podocarpus latifolius with Nothoseiridium podocarpi and Coleophoma podocarpi. b Conidiogenous cells. c Conidia. Scale bars: b = 400 µm, c = 10 µm. Redrawn from Crous et al. (2020). 

References

Crous PW, Wingfeld MJ, Chooi YH, Gilchrist CLM et al. 2020 – Fungal planet description sheets: 1042–1111. Persoonia 44, 301–459. 

Liu F, Bonthond G, Groenewald JZ, Cai L et al. 2019 – Sporocadaceae, a family of coelomycetous fungi with appendage-bearing conidia. Studies in Mycology 92, 287–415. 

 

Entry by 

Yanxia Li and Mingkwan Doilom, Innovative Institute for Plant Health/ Key Laboratory of Green Prevention and Control on Fruits and Vegetables in South China, Ministry of Agriculture and Rural Affairs, Zhongkai University of Agriculture and Engineering, Guangzhou, 510225, China.

 

(Edited by Kevin D Hyde, Mingkwan Doilom, Samaneh Chaharmiri-Dokhaharani, & Achala R. Rathnayaka)

Published online 1 April 2024

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