Ophioceras dolichostomum (Berk. & M.A. Curtis)
Index Fungorum number: 146613
Sexual morph: Ascomata immersed, lenticular to conical, ostiolate, beaked, black, solitary or gregarious. Neck long, black, periphysate. Paraphyses laonger than asci, persistence, hyaline, septate, tapering, 16 µm, at the base, 4 µm at the tip, formed of cells up to 50 µm long. Asci 116-132 ´ 8-10 µm, 8-spored, cylindrical, short pedunculate, unitunicate, thin-walled, with a non-amyloid ring-like apical apparatus, 3.2- 4 µm long ´ 2.4-3.2 µm wide. Ascospores 90-104 ´ 2.5-3.5 µm, 4-6- celled, hyaline in mass, filiform, straight or slightly curved or twisted in the ascus, curved on release, rounded and both end and lacking mucilage. Asexual morph: Undetermined.
Specimen examined: AUSTRALIA, north Queensland, submerged wood (Hyde1992b); JAPAN, Koito River, on submerged wood (Tsui et al.2001a); USA, Florida, on submerged wood (Conway and Barr1977); SEYCHELLES, Riviere St Marie-Louis, on submerged wood (Hyde and Goh1998a).
Fig 1. Ophioceras dolichostomum. No. 89–91. Ascomata on the substrate. No. 92, 93. Ascomatal neck surface. No. 94. Paraphyses. No. 95. Ascus apices with rings. No. 96. Ascus. No. 97. Ascospores. No. 89–91 by photomicrography; No. 92, 93, 95–97 by DIC; 94 by PH. Scale bars: 89–91 = 1 µm, 92–97 = 10 µm. 89, 90 from NY isotype; 91–97 from SMH1888. (Photo grabbed from Huhndorf et.al 2008).
Hyde KD. (1992) Tropical Australian Freshwater Fungi. IV. Halosarpheia aquatica sp. nov., Garethjonesia lacunosispora gen. & sp. nov. and Ophioceras dolichostomum (Ascomycetes). Aust. Syst. Bot. 5, 407-414
Shearer CA, Crane JL and Chen W. (1999) Freshwater Ascomycetes: Ophioceras Species. Mycological Society of America. 91, 145-156
Huhndorf SM, Greif M, Mugambi GK, Miller AN. (2008) Two new genera in the Magnaporthaceae, a new addition to Ceratosphaeria and two new species of Lentomitella. Mycologia. 100, 940-955
Recent SpeciesNeohelicomyces submersus