Leptosporella elaeidis
Leptosporella elaeidis Konta & K.D. Hyde, in Hyde et al., Mycosphere 11(1): 683 (2020)
Index Fungorum number: IF556361
Holotype – MFLU 19–0669
Saprobic on rachis and petioles of Elaeis guineensis Jacq. Sexual morph: Ascomata (included neck) 242–600 μm high × 625–1000 μm diameter (x̅ = 444 × 787 μm, n = 10), solitary, superficial, comprising black, carbonaceous, dome-shaped, raised blister-like areas, subglobose, flattened at the base, ostiolate. Ostiole central, carbonaceous, black, with periphyses. Peridium 63–113 μm wide (x̅ = 83 μm, n = 10), outer cells merging with the host epidermal cells, composed of dark brown to black cells of textura angularis. Paraphyses numerous, 2–7 μm diameter (x̅ = 4 μm, n = 10), branched, septate, longer than asci. Asci 125–210 × 9–14 μm (x̅ = 163 × 11 μm, n = 20), 8-spored, unitunicate, cylindrical, long-pedicellate, with a J-, wedge-shaped, subapical ring. Ascospores 124–136 × 2–4 μm (x̅ = 128 × 3 μm, n = 20), fasciculate, yellowish in mass, spiral, filiform, straight or curved, C-shaped or sigmoid, aseptate, rounded at the apex, pointed at the base, without polar mucilaginous appendages, smooth-walled. Asexual morph: Undetermined (Hyde et al. 2020).
GenBank numbers: ITS: MK659767, LSU: MK659772, SSU: MK659774, tef1: MN883560.
Notes: Phylogenetic analysis placed the strain of Leptosporella elaeidis with L. arengae, 61% ML (Fig. 8 in Hyde et al. 2020). Leptosporella elaeidis differs from L. arengae in having larger ascomata, asci and ascospores, and lack of polar mucilaginous appendages. This is the first record of L. elaeidis on Elaeis guineensis and the fourth record of Leptosporella species from a palm tree (Arecaceae) (Hyde et al. 2020).
Leptosporella elaeidis (Material examined – THAILAND, Suratthani Province, on dead rachis and petioles of Elaeis guineensis Jacq. (Arecaceae), 21 July 2017, Sirinapa Konta SRWD14b, MFLU 19-0669, holotype). a, b Appearance of ascomata on host substrate. c, d Close up of ascomata. e Yellowish ascospore mass. f, g Sections of ascoma. h Neck with periphyses. i Peridium. j Paraphyses (branch and septate at red arrow). k-m Asci. n-o J-, reaction of apical ring. p-u Ascospores. Scale bars: b, c = 1000 μm, d, e = 500 μm, f, g = 200 μm, h, j-n, p-u = 100 μm, i = 50 μm, o = 20 μm.
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