Pleosporales » Lophiostomataceae » Flabellascoma

Flabellascoma fusiforme

Flabellascoma fusiforme D.F. Bao, Z.L. Luo, K.D. Hyde & H.Y. Su

Index Fungorum number: IF 556721; Facesoffungi number: FoF 06213

Holotype: MFLU 19–0993

Etymology: referring to the fusiform ascospores

 

Saprobic on submerged decaying wood. Sexual morph: Ascomata 310–420 μm high, 320–380 μm diam (x̅ = 358 × 345 μm, n = 5), scattered, immersed, subglobose, dark brown to black. Ostiole crest-like, central, with a reduced crest and a pore-like opening, composed dark brown to black cells. Peridium 25–50 μm wide, composed two strata, outer stratum comprising brown to dark brown, thick-walled cells, inner stratum composed of several layers with lightly pigmented to hyaline cells. Hamathecium comprising 1.5–3 μm wide, septate, branched, cellular pseudoparaphyses. Asci 66–80 × 10–12 μm (x̅ = 72.8 × 10.8 μm, n = 20), 8-spored, bitunicate, fissitunicate, cylindrical-clavate with a furcate pedicel, apically rounded with a broad ocular chamber. Ascospores 15–18 × 4–5 μm (x̅ = 16.6 × 4.7 μm, n = 30), fusiform, with narrow and obtuse to acute ends, hyaline, uniseptate, 4-guttules, 2 middle ones larger than end ones, constricted at septum, smooth, with a thin sheath, appendages drawn out from sheath at both of ends (5.4–8 μm wide, n = 30), hyaline, unbranched. Asexual morph: Undetermined. (Description from Bao et al. 2019)

 

Material examined: CHINA, Yunnan Province, saprobic on decaying wood submerged in Nujiang River (27°37'29.92" N, 98°45'38.10" E), October 2016, Z.L. Luo, S-1583 (MFLU 19–0993, holotype), ex-type culture, MFLUCC 18–1584.

 

Notes: The new species Flabellascoma fusiforme fits well with the morphological characters of Flabellascoma, such as immersed ascomata, bitunicate, fissitunicate, cylindrical-clavate asci and fusiform, hyaline, 1-septate ascospores with a narrow bipolar sheath. We herein compare the morphological differences between new species Flabellascoma fusiforme with other Flabellascoma species. Flabellascoma fusiforme is phylogenetically close to F. aquaticum. However, Flabellascoma fusiforme can be easily distinguished from F. aquaticum by its ascomatal shape and ascus size. Flabellascoma fusiforme has ascomata with a short, elongated, crest-like ostiolar neck while the ascomata in F. aquaticum has a cylindrical, long, black neck and the asci of F. fusiforme are larger than F. aquaticum (66–80 × 10–12 vs. 48–72 × 8–9 μm). Flabellascoma fusiforme can be distinguished from F. cycadicola in having smaller ascospores (15–18 × 4–5 vs. 17–23 × 4.5–7 μm) and longer ascus pedicel. In addition, both the ascospores ends of F. cycadicola are narrower than F. fusiforme. Furthermore, F. fusiforme differs from F. minimum in its shape of ascomata and ascospores; F. fusiforme has subglobose ascomata and straight ascospores. However, F. minimum ascomata are ellipsoidal to lageniform and ascospores are slightly curved. (Notes from Bao et al. 2019)

 

Freshwater Distribution: China (Bao et al. 2019)

 

Fig. 1 Flabellascoma fusiforme (MFLU 19–0993, holotype). a–c Ascomata on submerged wood. c, d Section of ascoma. e, f Peridium of ascomata. g Pseudoparaphyses. h–j Asci. k–n Ascospore. Scale bars: c, d = 100 μm, e = 50 μm, f, h–j = 30 μm, g = 20μm, k–n = 10 μm. (Bao et al. 2019)

 

References

Bao DF, Su HY, Maharachchikumbur SSN, Liu JK, Nalumpang S, Luo ZL, Hyde KD (2019) Lignicolous freshwater fungi from China and Thailand: Multi-gene phylogeny reveals new species and new records in Lophiostomataceae. Mycosphere 10:1080–1099

 

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