Linocarpon calami
Linocarpon calami Konta & K.D. Hyde, in Hyde et al., Mycosphere 11(1): 686 (2020)
Index Fungorum number: IF556362
Holotype – MFLU 15-0277
Saprobic on petioles of Calamus. Sexual morph: Ascomata 147–187 μm high × 565–732 μm diameter (x̅ = 165 × 637 μm, n = 10), solitary or aggregated, superficial, comprising black, dome shaped, raised, blister-like areas, subglobose in section, flattened at the base, with a central ostiole. Peridium 33–70 μm diameter (x̅ = 47 μm, n = 10), outer cells merging with the host epidermal cells, composed of dark brown to black cells of textura angularis. Paraphyses 3–6 μm diameter (x̅ = 4 μm, n = 10), numerous, septate, longer than asci. Asci 120–160 × 13–21 μm (x̅ = 140 × 16 μm, n = 20), 8 spored, unitunicate, cylindrical, long-pedicellate, with a J-, wedge shaped, subapical ring. Ascospores 78–95 × 2–4 μm (x̅ = 91 × 5 μm, n = 20), parallel when immature, becoming spiral when mature, hyaline, filiform, straight or curved, aseptate, containing numerous refringent septum-like bands, ends rounded, without polar mucilaginous appendage at the apex, smooth-walled. Asexual morph: Undetermined.
GenBank numbers: SSU: MK659770, LSU: MK659765, ITS: MK659768
Notes: A new species is introduced based on morphology and comparison with known Linocarpon species as well as species reported in Thailand. Linocarpon calami fits with the generic concept of Linocarpon in having superficial, dome-shaped, cylindrical asci, with J-, apical ring and filiform ascospores with refringent bands. Comparisons of Linocarpon species known in Thailand shows that L. calami differs from L. arengae in having smaller ascomata, asci and ascospores without polar mucilaginous appendage. Linocarpon calami also differs from L. cocois in having larger ascospores containing numerous refringent septum-like bands. Therefore, L. calami is introduced as a new species and as the first geological record from the host genus Calanus (Arecaceae) in Thailand.
Linocarpon calami (THAILAND, Phang-Nga Province, on dead petioles of Calamus (Arecaceae), 6 December 2014, Sirinapa Konta DNH02a, MFLU 15-0277, holotype). a, b Appearance of ascomata on host substrate. c Close up of ascoma. d Off white to yellowish ascospore mass. e, f Section of ascoma. g Peridium. h J-, reaction of apical ring. i Paraphyses (septate at the red arrow). j, k Asci (k mature asci with immature asci and paraphyses). l-o Ascospores. Scale bars: b = 1000 μm, c = 500 μm, d-f = 200 μm, g-h = 20 μm, i-o = 50 μm (image from Hyde et al. 2020).
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