Fungalpedia- Note 174­, Serusiauxiella

 

Serusiauxiella S.H. Jiang, Lücking & J.C. Wei

Citation when using this entry: Shah et al. 2024 (in prep) – Fungalpedia, new genera in 2020. 

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

Classification: Strigulaceae, Strigulales, Dothideomycetidae, Dothideomycetes, Pezizomycotina, Ascomycota, Fungi

            Serusiauxiella was introduced with the type species S. filifera, which was isolated from the lichen and symbiont of the algae Trentepohlia in Nanglang village E’xian Ling, Dongfang City, Hainan, China (Jiang et al. 2020). Multigene phylogenetic analyses from ITS, LSU, SSU, TEF1-α, and RPB2 sequence data and morphological characters have established Serusiauxiella as a new genus. This genus is characterized by thallus appears grey to greenish as foliicolous and crustose. It forms circular patches that are subcuticular and separable from the leaf surface. The perithecia remain immersed-erumpent, appearing hemispherical to wart-shaped. The excipulum, prosoplectenchymatous, colorless, and involucrellum are mostly carbonized, dust-like, and black. The hamathecium is colourless, and I–, KI–. Paraphyses are usually unbranched or rarely sparsely branched and thin. The asci are 8-spored, bitunicate, with short tholus and narrow, ocular chamber, clavate to oblong, I–, KI–. Ascospores are biseriate or irregularly arranged, fusiform, colourless, and uniseptate (Jiang et al. 2020). The asexual morph of Serusiauxiella is characterized by immersed-erumpent, wart-shaped, black pycnidia, and two types of conidia: macroconidia and microconidia. Macroconidia are bacillar or filiform, and uniseptate, colourless. Both ends have gelatinous appendages. Microconidia are fusiform-ellipsoidal, colourless, and non-septate (Jiang et al. 2020). Serusiauxiella species resemble the Strigula s.str.microspore but differ by its applanate perithecia, short asci, and biseriate ascospores (Lücking 2008). Currently, there are three species listed in Index Fungorum (2023) under this genus.

            Type species: Serusiauxiella filifera S.H. Jiang, Lucking & J.C. Wei.

Other accepted species – (Species Fungorum – search Serusiauxiella)

Figure 1 –  Serusiauxiella filifera. a Thallus. b Asci. c, d Ascospores. Scale bars: a = 600 μm, b–d = 10 μm. Redrawn from Jiang et al. (2020).

 

References

Jiang SH, Lücking R, Xavier-Leite AB, Cáceres ME et al. 2020 – Reallocation of foliicolous species of the genus Strigula into six genera (lichenized Ascomycota, Dothideomycetes, Strigulaceae). Fungal Diversity 102, 257 – 91. 

Lücking R. 2008 – Foliicolous lichenized fungi, vol 103. Published for the organization for Flora Neotropica by the New York Botanical Garden Press, Bronx, pp 1–866.

 

Entry by

Sujit Shah, Center of Excellence in Fungal Research and School of Science, Mae Fah Luang University, Chiang Rai, 57100, Thailand. 

 

(Edited by Antonio R. Gomes de Farias, Samaneh Chaharmiri-Dokhaharani, & Achala R. Rathnayaka)

 

Published online 10 January 2024

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