Trypetheliales » Trypetheliaceae

Schummia

Schummia Lücking, R. Miranda & Aptroot, in Hongsanan et al., Fungal Diversity: 10.1007/s13225-020-00462-6, [174] (2020).

Index Fungorum number: IF 836810; Facesoffungi number: FoF 08824, 1 morphological species (Species Fungorum 2022), no molecular data available

Lichenized (weakly so) on bark in terrestrial, lowland to lower montane subtropical habitats (Azores). Thallus ecorticate, pale brownish (to pinkish). Photobiont Trentepohlia. Sexual morph: Ascomata solitary, erumpent, brown-black to carbonaceous, applanately wart-shaped to irregular in outline, ostiolate, ostiole apical. Involucrellum weakly developed, with periderm layers, carbonaceous. Excipulum prosoplectenchymatous, brown-black, in apical parts fused with involucrellum. Hamathecium comprising paraphysoids, hyaline, straight to somewhat wavy, slightly branched. Asci 8-spored, bitunicate, fissitunicate, clavate, short pedicellate, with a non-amyloid, rather long ocular chamber. Ascospores irregularly arranged to biseriate, ellipsoid to drop-shaped, grey-brown, uniseptate, with a central euseptum and rectangular lumina, the terminal walls much thickened and inflated, not or slightly constricted at the septa. Asexual morph: Pycnidia unknown. Chemistry: no substances detected by TLC (adapted from Hongsanan et al. 2020b).

 Type species: Schummia angulata (Aptroot & Schumm) Lücking, R. Miranda & Aptroot

Notes: Schummia is characterised by solitary, erumpent, brown-black to carbonaceous ascomata, hyaline, straight to somewhat wavy hamathecium, and ellipsoid to drop-shaped, grey-brown, uniseptate ascospores. In their mature stage, the ascospores of Schummia resemble those of members in Arthoniaceae and Graphidaceae. Schummia angulata was initially known as Distothelia angulata but was not congeneric with the type species of Distothelia, D. isthmospora since it has different ascospore shape and occurrence of endospore which form two strongly thickened terminal walls. The young ascospores of Schummia are 3-euseptate resembling those of Pseudobogoriella. With time, the two terminal lumina is occupied with endospore material and appears swollen while the two-remaining central lumina looks smaller than the thickened terminal walls (Hongsanan et al. 2020b). Schummia is a distinct lineage in Trypetheliaceae. Molecular data is lacking. Fresh collections with DNA sequence data are needed to confirm the taxonomic placement of the genus.

 

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