Pleosporales » Lindgomycetaceae » Neolindgomyces

Neolindgomyces submersus

Neolindgomyces submersus (K.D. Hyde & Goh) Jayasiri & K.D. Hyde [as 'submersa']

Basionym: Quintaria submersa K.D. Hyde & Goh, Nova Hedwigia 68(1-2): 262 (1999)

Index Fungorum number: IF555557; Facesoffungi number: FoF05262

Holotype: HKU(M) 811

 

Cultural characteristics: Colonies on potato-dextrose agar slow-growing, dark brown with brown aerial mycelium, with a reddish brown outer margin, woolly, zonate, no fruiting structures produced.

 

Saprobic in submerged decaying wood in a small river. Sexual morph: Ascomata 130–195 µm high, 455–585 µm diam., mostly depressed globose or some conical with flattened bases, immersed, coriaceous, scattered, with a small clypeus, ostiolate, umbilicate, dark to black, gregarious. Peridium 12–20 µm thick, a single stratum of 4–6 layers of brown pseudoparenchymatous angular cells mixing with host cells at the outside with brown pigment deposits, thin and difficult to see at the base. Neck up to 104 µm diam., rounded or cylindrical, central or occasionally excentric, ostiolar canal filled with a network of thin, hyaline hypha e, embedded in a gelatino us matrix. Clypeus small, surrounding the ostiole, composed of host cells, brown fungal hyphae and melanin particles. Hamathecium comprising up to 2.5 µm wide trabeculae, which become branched, anastomosing above the asci and merging with the filaments in the ostiolar canal, embedded in a gelatinous matrix. Asci 144–212 × 22–33 µm, 8-spored, cylindrical clavate, short-pedicellate, thick-walled, fissitunicate, with an inconspicuous apical thickening, not bluing in KI; arising from a basal ascogenous tissue. Ascospores 50–68 × 10–14 µm, bi-triseriate, cylindrical, (4-)6-septate, slightly constricted at each septum, third or fourth cell from top being broadest, hyaline, brown in old, dried specimens, densely guttulate, straight or weakly curved, occasionally with an inconspicuous sheath with a regular margin. Asexual morph: Undetermined (Descriptions from Hyde and Goh 1999)

 

Material examined: AUSTRALIA, north Queensland, Atherton Tablelands, Clohesy River, on decaying wood submerged in small river, May 1991, K.D. Hyde (HKU(M) 811).

 

Other material examined: Australia, north Queensland, Atherton Tablelands, Clohesy River, on submerged wood, Feb. 1991, K.D. Hyde (HKU(M) 642); ibid. Dec. 1990, (HKU(M) 379B); ibid. (HKU (M) 847); ibid. (HKU(M) 599B).

 

Freshwater distribution: Australia (Hyde and Goh 1999)

 

Figs 35, 36. Neolindgomyces submersus (holotype). 35. Clypeus and neck on host surface. 36. Peridium in frontal section. Scale bars = 10 µm. (Hyde and Goh 1999)

 

Figs 37-43. Neolindgomyces submersus (holotype). 37-40. Asci; note the fissitunicate dehiscence. 41-43. Ascospores; note the delicate membrane in 41. Scale bar = 10 µm. (Hyde and Goh 1999)

 

References:

Hyde KD, Goh TK (1999b) Tropical Australian Freshwater Fungi. XVI. Some new melanommataceous fungi from woody substrata and a key to genera of lignicolous loculoascomycetes in freshwater. Nova Hedwigia 68:251–272

 

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