Panorbis
viscosus
(I. Schmidt) J. Campb., J.L. Anderson & Shearer Mycologia 95: 544 (2003)
Sordariomycetes, Subclass Hypocreomycetidae
Microascales
Halosphaeriaceae
Sexual morph: Ascomata 68-(248)-455 μm high, 68-(250)-385 μm diam., globose to subglobose, at first hyaline becoming black, membranous, superficial or immersed, ostiolate. Necks 73-(262)-648 μm high, 18- (36)-54 μm diam., dark at base becoming hyaline at apex, periphysate. Peridium two-layered, composed of an outer layer of cells of textura angularis and an inner layer of elongated cells with large lumina. Catenophyses absent. Asci 36-(65)-114 × 9-(13)-23 μm, thin-walled, unitunicate, eight-spored, ellipsoid to clavate, deliquescing. Ascospores 13-(20)-26 × 4-(7)-8 μm, hyaline, ellipsoidal, thin-walled, 1-septate, appendaged. Appendages bipolar, hamate shorter than the mid-septum, unfurling into fine thread in water. Asexual morph: Undetermined.
Key references:
Campbell J, Anderson JL, Shearer CA. (2003) Systematics of Halosarpheia based on morphological and molecular data. Mycologia 95: 530-552.
Jones EBG, Suetrong S, Sakayaroj J, Bahkali AH, Abdel-Wahab MA, Boekhout T, Pang KL (2015) Classification of marine Ascomycota, Basidiomycota, Blastocladiomycota and Chytridiomycota. Fungal Diversity 73: 1-72.
Maharachchikumbura SSN, Hyde KD, Jones EBG, Mckenzie EHC, Huang SK, Abdel-Wahab MA et al. (2015) Towards a natural classification and backbone tree for Sordariomcyetes. Fungal Diversity 72: 199-299.
Pang KL, Vrijmoed LLP, Kong RYC, Jones EBG. (2003) Polyphyly of Halosarpheia (Halosphaeriales, Ascomycota): implications on the use of unfurling ascospore appendage as a systematic character. Nova Hedwigia 77: 1-18.
Pang KL, Chiang WL, Jheng JS (2012) Morphological evaluation of peridial wall, ascus and ascospore characteristics in the delineation of genera with unfurling ascospore appendages (Halosphaeriaceae). In: Progress in molecular and subcellular biology 53:159-171.
Schmidt I. (1985) Types and type collections of new higher marine and freshwater fungi from the Baltic Coast. Mycotaxon 24: 419-421.
Image: Panorbis viscosus. (a) Section of immersed ascoma with a periphysate neck. (b) Ascoma neck with periphyses. (c) Two-layered peridium, outer layer of cells of textura angularis, inner layer of elongated cells with large lumina. (d) Thin-walled, clavate ascus. (e)
Thin-walled ascospore with bipolar, unfurling appendages. Scale bar: a=50 μm; b, c=30 μm; d, e=10 μm. Photo reproduced with the permission of the National Taiwan Ocean University.