Pachysacca
Pachysacca Syd., Annls mycol. 28(5/6): 435 (1930).
Index Fungorum number: IF 3675; Facesoffungi number: FoF 00126, 3 morphological species (Species Fungorum 2022), no molecular data available.
Saprobic on Eucalyptus leaves. Sexual morph: Ascostromata black, immersed at the base, fused with host surface, nearly flattened at the top, solitary or scattered, multiloculate, with 2–4 locules. Peridium of locules composed of pale brown to brown cells of textura angularis. Hamathecium lacking pseudoparaphyses. Asci 8-spored, bitunicate, fissitunicate, narrowly cylindrical at the upper and broadly oblong at the end, with a short pedicel. Ascospores over-lapping, uniseriate to multiseriate, hyaline, 1−2-septate, narrowly cylindrical, with broadly rounded ends, smooth-walled. Asexual morph: Unknown (adapted from Thambugala et al. 2014).
Type species: Pachysacca eucalypti Syd.
Notes: Pachysacca is characterised by black ascostromata immersed at the base and fused with the host substrate, asci which are narrowly cylindrical at the upper and broadly oblong at the end and ascospores which are hyaline, 1−2-septate, narrowly cylindrical, with broadly rounded ends. Swart (1982) added two new species P. pusilla and P. samuelii to the genus. Hawksworth et al. (1995) and Lumbsch and Huhndorf (2010) accommodated Pachysacca in Dothideaceae. Thambugala et al. (2014) re-examined the type specimen P. eucalypti, excluded Pachysacca from Dothideales and transferred it to Teratosphaeriaceae based on morphology. Pachysacca is currently a distinct genus in Teratosphaeriaceae, but DNA sequence data is needed to confirm the taxonomic placement of the genus.
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