Pseudohalonectria Minoura & T. Muroi
Asexual morph: Hyphomycetous, phialidic. Phialides hyaline, micronematous, flask-shaped. Conidia allantoid, hyaline, aseptate. Sexual morph: Ascomata immersed or partially immersed, with a long neck, globose to subglobose. Peridium membranous. Paraphyses numerous, septate, hyaline. Asci unitunicate, cylindrical, straight or curved, with J-, thimble-shaped apical ring. Ascospores overlapping uniseriate to biseriate, multi-seriate, filiformes, septate.
Notes: The genus Pseudohalonectria was introduced to accommodate P. lignicola (Minoura & Muroi 1978). Hongsanan et al. (2017) introduced Pseudohalonectriaceae as a new family within Magnaporthales to accommodate Pseudohalonectria. Sixteen species are accepted in this genus, of which six species have been reported from freshwater habitats worldwide (Minoura and Muroi 1978; Shearer 1989a, b; Hyde et al. 1998; Cai et al. 2002).
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
Figs. 1-6. Pseudohalonectria lignicola. Fig. 1. Developing and mature asci and paraphyses. x410. Fig. 2. Attachment of asci and a paraphysis to ascogenous hyphae. X775. Fig. 3. Ascus mounted in water showing thimble-shaped ascus apparatus. x450. Fig. 4. Ascus fixed and stained in lactic acid with azure A and showing free basal end. x480. Fig. 5. Immature ascus with partially ruptured wall mounted in water and showing thimble-shaped ascus apparatus and frill of ascogenous hyphae attached to basal end. x633. Fig. 6. Ascospores mounted in water showing cells filled with lipid droplets. x595. Figs.7 and 8. P. adversaria. Fig. 7. Ascospores mounted in water showing cells filled with lipid droplets. x997. Fig. 8. Developing asci and paraphyses attached to ascogenous hyphal system. x550.