Pleosporales » Lindgomycetaceae » Lindgomyces

Lindgomyces aquaticus

Lindgomyces aquaticus W. Dong, H. Zhang & K.D. Hyde

 

Index Fungorum number: IF557914; Facesoffungi number: FoF09256

Etymology: referring to aquatic habitat of this fungus

Holotype: MFLU 18-1711

 

Saprobic on decaying wood submerged in freshwater. Sexual morph: Ascomata 160–200 μm high, 220–250 μm wide, black, scattered, semi-immersed to nearly superficial, ellipsoidal or lenticular, coriaceous. Peridium 1.5–2.5 μm, comprising several layers of brown, thin-walled, large cells of textura angularis or subglobose cells, flattened and poorly developed at the base. Pseudoparaphyses 1.5–2.5 μm diam., sparse, cellular, hypha-like, hyaline, septate, persistent, embedded in a gelatinous matrix. Asci 150–250 × 33–43 μm ( = 210 × 39 μm, n = 10), 8-spored, bitunicate, mostly broadly clavate, rarely narrowly clavate, or cylindrical, apically rounded with well-developed ocular chamber. Ascospores (59–)68–71 × 12–16 μm ( = 70 × 14 μm, n = 15), overlapping bi- to tri-seriate, straight or slightly curved, hyaline and 1-septate when young, slightly constricted at the septa, turn to pale brown and 5-septate when germinated, fusiform with rounded or acute ends, with minute and some large guttulate, thin-walled, smooth, lacking a mucilaginous sheath. Asexual morph: Undetermined. (Description from Dong et al. 2020)

 

Material examined: THAILAND, Songkhla Province, on submerged wood in a stream, 10 May 2018, W. Dong, hat8115-1 (MFLU 18-1711, holotype), ex-type living culture MFLUCC 18-1416; ibid., hat8115-2 (HKAS 105029, isotype), ex-type living culture KUMCC 19-0044.

 

Freshwater distribution: Thailand (Dong et al. 2020)

 

Notes: Lindgomyces aquaticus clusters with an unnamed species Lindgomyces sp. KH241 with high bootstrap support in Dong et al. (2020). Lindgomyces aquaticus differs from KH241 by its larger asci (150–250 × 33–43 μm vs. 125–194 × 20.5–29 μm), ascospores ((59–)68–71 × 12–16 μm vs. 47–62 × 8–12 μm) and different habitats (freshwater vs. intertidal) (Hirayama et al. 2010). A large, sticky sheath is observed in KH241, but not in the collection of Dong et al. (2020): MFLUCC 18-1416. The comparison of single gene between L. aquaticus (MFLUCC 18-1416) and Lindgomyces sp. (KH241) shows that there are one, zero and seven nucleotide differences in LSU, SSU and ITS sequence data, respectively. Morphological characters mentioned above can easily separate them to be different species. Lindgomyces aquaticus also differs from L. ingoldianus (type) in having wider asci (150–250 × 33–43 μm vs. (110–)120–167.5(–182.5) × 25–32.5 μm), larger ascospores ((59–)68–71 × 12–16 vs. (47–)50–59 × 9–11(–12)) and without sheath (Hirayama et al. 2010). Dong et al. (2020) introduced L. aquaticus and retain KH241 as Lindgomyces sp. (Notes from Dong et al. 2020)

Fig. 58

Fig 1. Lindgomyces aquaticus (MFLU 18-1711, holotype). a, b Appearance of ascomata on host surface. c Vertical section of ascoma. D Structure of peridium. eg Bitunicate asci. h Ascus embedded in pseudoparaphyses. ik Ascospores. l Ascospore in Indian Ink. M Germinated ascospore. n, o Colony on PDA (left-front, right-reverse). Scale bars: c, m = 50 μm, dl = 20 μm

 

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

Hirayama K, Tanaka K, Raja HA, Miller AN, Shearer CA (2010) A molecular phylogenetic assessment of Massarina ingoldiana sensu lato. Mycologia 102:729–746

 

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