Pleosporales » Occultibambusaceae » Occultibambusa

Occultibambusa kunmingensis

Occultibambusa kunmingensis C.X. Liu, H. Zhang & K.D. Hyde

Index Fungorum number: IF557930; Facesoffungi number: FoF09272

Etymology: referring to Kunming, where the holotype was collected

Holotype: HKAS 102151

 

Saprobic on decaying bamboo submerged in freshwater. Sexual morph: Ascomata 110–150 μm high, 220–260 μm diam., black, scattered, semi-immersed to superficial, with a short neck, ellipsoidal, ostiolate, flattened at the base. Ostiolar neck black, short, always broken off, with a large opening on the surface of ascomata. Peridium 30–50 μm thick, thin at the base and becoming wider laterally, composed of several layers of brown to dark brown, thin-walled cells of textura angularis. Pseudoparaphyses 2.2 μm wide, cellular, hypha-like, hyaline, septate. Asci 8-spored, bitunicate, clavate or cylindric-clavate, 110–140(–160) × 13–16.5 μm (x̄ = 127 × 15.5 μm, n = 10), narrowly rounded at the apex, with a distinct ocular chamber, pedicellate. Ascospores 32–40 × 5–6.5 μm (x̄ = 35.5 × 5.5 μm, n = 30), 3–4-seriate, fusiform, straight, or curved, brown, 1-septate, becoming 3-septate when germinated, constricted at the septa, upper cell slightly shorter and wider than lower part, guttulate, thin-walled, smooth, without any mucilaginous sheaths and appendages. Asexual morph: Undetermined. (Descriptions from Dong et al. 2020)

 

Culture characteristics: On PDA, colony circular, reaching 30 mm in 30 days at 25°C, dark brown from above, black from below, surface rough, with dense mycelium, dry, raised, edge entire.

 

Material examined: CHINA, Yunnan Province, Kunming University of Science and Technology, on submerged bamboo in a stream, 10 May 2017, C.X. Liu, L62 (HKAS 102151, holotype).

 

Notes: Occultibambusa kunmingensis is morphologically similar to O. jonesii in having cylindrical to clavate asci, fusiform, curved, brown, guttulate ascospores without any mucilaginous sheaths and appendages (Zhang et al. 2017). However, O. kunmingensis has longer asci (110–140(–160) × 13–16.5 μm vs. (65–)75–89(–105) × 13.5–19 μm) and ascospores (32–40 × 5–6.5 μm vs. 27–33.5 × 5.5–6.5 μm). Occultibambusa kunmingensis has a prominent, black, short neck, which is absent in O. jonesii (Zhang et al. 2017). (Notes from Dong et al. 2020)

 

Freshwater distribution: China (Dong et al. 2020)

 

Fig 1. Occultibambusa kunmingensis (HKAS 102151, holotype). a–d Ascomata on host substrate. e Vertical section of ascoma. f Structure of peridium. g Pseudoparaphyses. h–k Bitunicate asci. l Ocular chamber. m–p Ascospores. q Germinated ascospore. r, s Colony on PDA (left-front, right-reverse). Scale bars: e = 50 μm, f, h–k, m–q = 20 μm, g, l = 10 μm (Dong et al. 2020)

 

References

Dong W, Wang B, Hyde KD, McKenzie EHC, Raja HA, Tanaka K, Abdel-Wahab MA, Abdel-Aziz FA, Doilom M, Phookamsak R, Hongsanan S, Wanasinghe DN, Yu XD, Wang GN, Yang H, Yang J, Thambugala KM, Tian Q, Luo ZL, Yang JB, Miller AN, Fournier J, Boonmee S, Hu DM, Nalumpang S, Zhang H (2020) Freshwater Dothideomycetes. Fungal Divers 105:319–575. https://doi.org/10.1007/s13225-020-00463-5

Zhang JF, Liu JK, Hyde KD, Yang W, Liu ZY (2017) Fungi from Asian Karst formations II. Two new species of Occultibambusa (Occultibambusaceae, Dothideomycetes) from karst landforms of China. Mycosphere 8:550–559. https://doi.org/10.5943/MYCOSPHERE/8/4/4

 

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