Pleosporales » Didymosphaeriaceae » Tremateia

Tremateia lamiacearum

Tremateia lamiacearum Samarak. & K.D. Hyde, in Hyde et al., Fungal Diversity 100: 57 (2020)

Index Fungorum number: IF556786         Facesoffungi number: FoF06463


Sexual morph: Ascomata 140–240 μm high, 110–190 μm diam. (x̄ = 200.5 × 155.7 μm, n = 5), immersed to erumpent, globose or subglobose, dark brown to black. Peridium 6–11.5 μm wide, comprising 3–4 layers, of dark brown cells of textura angularis. Hamathecium comprising 2–3 μm wide (x̄ = 2.6 μm, n = 20), numerous, cellular, branched, septate, hyaline pseudoparaphyses. Asci 82–105 × 13–17 μm (x̄ = 93.7 × 14.4 μm, n = 20), 8-spored, bitunicate fissitunicate, clavate, pedicellate, thick-walled at the apex, with ocular chamber. Ascospores 15–20 × 7–9 μm (x̄ = 17.2 × 7.3 μm, n = 30), overlapping 1–2-seriate, mostly ellipsoidal, muriform, 3–5-transversely septate, with 1–2 vertical septa,

deeply constricted at the middle septum, slightly constricted at the remaining septa, initially hyaline to pale yellow, becoming brown at maturity, rounded at both ends, surrounded by a thick mucilaginous sheath. Asexual morph: Undetermined.


Material examined: THAILAND, Phayao Province, Phachang Noi, Pong, 19.32 N 100.46E, 545 m, on dead branch of Lamiaceae sp., 11 September 2017, M.C. Samarakoon, SAMC012 (MFLU 18-0826, holotype); ibid., KUNHKAS 102315 (isotype).


GenBank Accession No: LSU: MN473055, SSU: MN473049, TEF1-a: MN481601, TUB2: MN481605

Notes: Tremateia lamiacearum has close affinity to Tremateia species by immersed to erumpent, globose ascomata, numerous cellular pseudoparaphyses, fissitunicate and clavate asci and ellipsoid muriform ascospores. Tremateia guiyangensis and T. lamiacearum share immersed to semiimmersed

or erumpent, subglobose ascomata and muriform, normally overlapping 1–2-seriate, ellipsoid, with 3–5-transversely septate ascospores. However, T. lamiacearum differs from other Tremateia species in having comparatively small asci (93.7 × 14.4 μm) and ascospores (17.2 × 7.3 μm) with large mucilaginous sheath (Hyde et al. 2016). A BLASTn search of LSU in GenBank shows our new species is similar to T. arunicola (MFLUCC 16-1275; KX274248, 99% similarity) and T. guiyangensis (GZAAS01; KX274247, 99% similarity). Phylogenetically, T. lamiacearum shares a sister relationship to T. arunicola and T. guiyangensis with significant statistical support in the ML analysis (75% ML). Based on clear morphological differences and available molecular data, we introduce T. lamiacearum as a new species following the guidelines by Jeewon and Hyde (2016).


 Figure X. Tremateia lamiacearum (MFLU 18-0826, holotype). a–c Appearance of ascomata on the substrate. d Vertical section of ascoma. e–h Asci. i Peridium. j Pseudoparaphyses. k–o Ascospores (o in Indian ink showing mucilaginous sheath. Scale bars:b = 1000 μm, c = 200 μm, d = 100 μm, e–i = 20 μm, j–o = 10 μm


: Hyde KD, Dong Y, Phookamsak R, Jeewon R et al. (2020) Fungal diversity notes 1151–1276: taxonomic and phylogenetic contributions on genera and species of fungal taxa. Fungal Diversity (2020) 100:5–277.


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