Botryosphaeriales » Botryosphaeriaceae

Leptoguignardia

Leptoguignardia E. Müll., Sydowia 9(1-6): 216 (1955)

Index Fungorum number: IF 2777; Facesoffungi number: FoF 09788 , 2 morphological species (Species Fungorum 2021), no molecular data available.

Hemibiotrophic or saprobic on petioles. Sexual morph: Ascostromata black, scattered, clustered or fusing in groups of 2–3, initially immersed, becoming erumpent but still under host tissue, ovoid to globose, coriaceous. Papilla central, ostiole with a pore. Pseudoparaphyses sparse, hyphae-like, not commonly observed in herbarium material. Peridium comprising small heavily pigmented thick-walled cells of textura angularis. Asci 8–spored, bitunicate, fissitunicate, cylindrical to clavate, with a short blunt pedicel, ocular chamber not clear. Ascospores hyaline, 2–septate, fusiform, asymmetrical, central cells widest, ends cells longer and tapering, smooth-walled. Asexual morph: “Dothichiza”-like morph forming on same tissue. Pycnidia black, scattered, or fusing in groups or with locules, immersed, becoming erumpent, but still under host tissue, ovoid, coriaceous, scattered amongst locules. Conidiogenous cells hyaline, cylindrical, holoblastic. Conidia hyaline, 1–septate, septum nearer to apex, slightly constricted, ovoid with round ends (adapted from Liu et al. 2012).

 

Type species: Leptoguignardia onobrychidis E. Müll.

 

Notes: Leptoguignardia is characterised by black ascostromata, cylindrical to clavate asci, and hyaline, 2–septate ascospores. Sequence data is lacking for Leptoguignardia. Leptoguignardia was placed in Botryosphaeriaceae based on the ascomata and ascal characters. Currently, Leptoguignardia is in Botryosphaeriales, genera incertae sedis. Fresh collections with DNA sequence data are needed to confirm its taxonomic placement.

 

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