Saccardinula
Saccardinula Speg., Anal. Soc. cient. argent. 19(6): 257 (1885).
Index Fungorum number: IF 4809; Facesoffungi number: FoF 07915, 12 morphological species (Species Fungorum 2022), no molecular data available.
Thalli forming raised black spots on the lower leaf surface. Individual ascomata gregarious, superficial, very easily removed from host surface, ovoid to globose, black, with the two different regions; the central region comprising dark brown radiating cells with the ascomata and the marginal parts comprising lighter brown radiating cells. Sexual morph: Ascomata subglobose, fusing with one or more ascomata, with a single locule distributed inside each ascoma, with single asci inside each locule. Paraphyses not seen. Asci 8–spored, bitunicate, globose to oblong, without pedicel. Ascospores ellipsoid–fusiform, with a few trans septa and occasional longitudinal septa. Asexual morph: unknown (adapted from Li et al. 2011).
Type species: Saccardinula guaranitica Speg.
Notes: Saccardinula was introduced by Spegazzini (1885) with S. guaranitica as type species. Saccardinula is characterised by subglobose ascomata, globose to oblong asci lacking pedicel, ellipsoid–fusiform ascospores with few trans septa and sometimes longitudinal septa. Luttrell (1973) referred Saccardinula to Saccardinulaceae based on the ascostromata grouped in a radiate, superficial, cellular membrane. Von Arx and Müller (1975) referred Saccardinula to Myriangiaceae based on the small ascomata, pustulate at the centre, and short hyaline ascospores. Barr (1979) retained Saccardinula in “Saccardinulaceae.” Lumbsch and Huhndorf (2007) transferred Saccardinula to Elsinoaceae. Li et al. (2011) re-examined the holotype specimen of S. guaranitica from LPS and reported that the species has ascomata similar to members of Microthyriaceae except Brefeldiella which has ascomata forming radiating cells and a darker central raised area in which the asci form. Saccardinula differs from members of Elsinoe in having a less developed thallus while those of Elsinoe species covers the thyriothecia (Li et al. 2011). Li et al. (2011) treated Saccardinula in Brefeldiellaceae which is now a synonym of Trichopeltinaceae. Saccardinula is morphologically a distinct genus in Trichopeltinaceae but molecular data is needed to confirm this taxonomic placement.
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