Fungalpedia – Note 226, Guayaquilia

 

Guayaquilia R.F. Castañeda, Magdana, D. Sosa & Hern. -Restr. 

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

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

Classification: Incertae sedis, Xylariales, Xylariomycetidae, Sordariomycetes, Pezizomycotina, Ascomycota, Fungi.

Based on the phylogenetic analysis of the combined LSU and ITS sequences revealed that three strains (MUCL 39017, CCMCIBE-H312, and CCMCIBE-H320), identified as Idriella cubensis formed a monophyletic lineage distinct from a clade containing I. lunata (the generic type). These strains were phylogenetically distant from Microdochiaceae (Xylariales). Therefore, Magdama et al. (2020) established a new genus Guayaquilia to accommodate Guayaquilia cubensis (≡ I. cubensis (Castañeda & Arnold 1985) based on morphological and phylogenetic analyses. Guayaquilia has been reported as a saprobic collected from decaying leaves of Theobroma cacao (Malvaceae) in Ecuador, as well as from decaying leaves of Calophyllum calaba (Clusiaceae) and Cupania sp. (Sapindaceae) in Cuba (Magdama et al. 2020). The genus is monotypic and is characterized by macronematous, tree-like, fasciculate, profuse dichotomously, alternately, or irregularly branched, brown conidiophores with polyblastic, denticulate, sympodial extended, intercalary, and terminal conidiogenous cells that produce solitary, sublunate, subnavicular, lunate, inequilateral, (0–)1-septate, hyaline conidia (Magdama et al. 2020). The taxonomic placement of Guayaquilia is in the Xylariales genus incertae sedis (Magdama et al. 2020, Wijayawardene et al. 2022). 

Type species: Guayaquilia cubensis (R.F. Castañeda & G.R.W. Arnold) R.F. Castañeda, Magdana, D. Sosa & Hern.-Restr (Basionym: Idriella cubensis R.F. Castañeda & G.R.W. Arnold)

 

Figure 1 – Guayaquilia cubensis (a, b holotype, INIFAT C83/57-1; c–f CCMCIBE-H312). a, b Conidiophores, conidiogenous cells. c, d Conidiogenous cells. e, f Conidia. Scale bars: a, b = 50 µm, c–f = 10 µm. Redrawn from Magdama et al. (2020).

 

References

Castañeda Ruíz RF, Arnold GRW. 1985 – Deuteromycotina de Cuba. I. Hyphomycetes. Revista del Jardín Botánico Nacional Universidad de la Habana 6, 47–67.  

Magdama F, Sosa D, Espinoza F, Serrano L et al. 2020 – Guayaquilia gen. nov., typified by Idriella cubensis. Mycotaxon 135, 501–512. 

Wijayawardene NN, Hyde KD, Dai DQ, Sánchez-García M et al. 2022 – Outline of Fungi and fungus-like taxa – 2021. Mycosphere 13, 53–453. 

 

Entry by 

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, Samaneh Chaharmiri-Dokhaharani, & Achala R. Rathnayaka)

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