Magnaporthales » Pseudohalonectriaceae » Pseudohalonectria

Pseudohalonectria lignicola

Pseudohalonectria lignicola Minoura & T. Muroi

 

Sexual morph: Ascomata solitary to aggregated, immersed to superficial, pale yellow at first, becoming darkened with age, rostrate; venter globose to flattened globose, 227–497 × 243–524 µm, peridium membranous, tissue of textura angularis in face view, 13–15 cell layers thick, outer cells pseudoparenchymatic, darkened yellow and compressed laterally, inner cells pseudoparenchymatic, pale yellow. Beaks long, cylindrical, periphysate, composed of parallel hyphae, outer hyphae ending in enlarged, outwardly directed, subglobose cells,170–621 × 65–22 µm. Paraphyses longer than asci, wide at base, tapering to a rounded point, thin walled, attached to ascogenous hyphae, 108–198 × 3.6–8.4 µm at base, 1- to 5-septate. Asci unitunicate, cylindrical, straight or sigmoidal, with IKI-negative, thimble-shaped apical apparatus which stains bright blue in acidic aqueous cotton blue, containing eight ascospores in two overlapping fascicles of four, 90–132 × 11–17.6 µm, separating at the basal septum from ascogenous hyphae and lying free in venter, lining the base and sides of ascomata. Ascospores yellow in mass, becoming orange brown with age, hyaline to pale orange brown in transmitted light, cylindrical with bluntly rounded apices, sometimes allantoid, 38.4–74.8 × 3.6–6.6 (x̄  = 62.6 × 5.1 µm), 5- to 11-septate, not constricted at the septa, discharged forcibly or accumulating in a mass at the beak opening. Asexual morph: Undetermined. (Shearer 1989a)

 

Culture characters: Colonies on CMA floccose, appressed, white at first, becoming pale to lemon yellow, pale yellow in reverse, colony margin even. Hyphae septate, smooth walled, 1–2.5 µm diam., hyaline.

 

Distribution: CHINA, Yunnan Province, Lake Fuxian, on submerged wood (Cai et al. 2002); JAPAN, Koito River, on submerged wood (Tsui et al. 2001), Lake Biwa, on submerged wood (Minoura and Muroi 1978); USA, Illinois, Indiana, on submerged wood in streams or Rivers (Shearer 1989a, b).

 

Notes: Holotype HUT 40005. ITS, LSU, SSU, RPB1, TEF1a, MCM7 and b-tubulin sequence data are available.

 

References

Cai L, Tsui CKM, Zhang KQ, Hyde KD (2002) Aquatic fungi from Lake Fuxian, Yunnan, China. Fungal Divers 9:57–70.

Hongsanan S, Maharachchikumbura SSN, Hyde KD, Samarakoon MC et al. 2017 – An updated phylogeny of Sordariomycetes based on phylogenetic and molecular clock evidence. Fungal Diversity 84, 25–41.

Hyde KD, Goh TK (1998) Tropical Australian freshwater fungi XIII. A new species of Anthostomella and its sporodochial Geniculosporium anamorph. Nova Hedwig 67:225–233.

Minoura, K.; Muroi, T. 1978. Some freshwater ascomycetes from Japan. Transactions of the Mycological Society of Japan. 19:129-134.

Shearer CA (1989a) Pseudohalonectria (Lasiosphaeriaceae), an antagonistic genus from wood in freshwater. Can J Bot 67:1944–1955

Shearer CA (1989b) Aniptodera (Halosphaeriaceae) from wood in freshwater habitats. Mycologia 81:139–146

Tsui CKM, Hyde KD, Fukushima K (2001) Fungi on submerged wood in the Koito River, Japan. Mycoscience 44:55–59

 

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