Kohlm., 1977. Rev. Mycol., 41: 191.


Sordariomycetes, Subclass Hypocreomycetidae






Bathyascus Kohlm., 1977. Rev. Mycol., 41: 191.

Type species:

Bathyascus vermisporus Kohlm., 1977. Rev. Mycol., 41: 191.

Sexual morph. Saprobic, Ascomata; 150-260 µm high (including necks), 215-480 µm in diam., solitary, subglobose or ellipsoidal, partly or completely immersed, ostiolate, papillate, coriaceous, dark brown above, light brown to almost hyaline at the base. Peridium: 40-45 µm thick around the ostiole, 20-30 um at the base and sides, composed of 5 or 6 layers of thin-walled, polygonal, elongated cells with large lumina, forming a textura angularis, mearging into the pseudoparenchyma of the centrum. Necks: 60-380 µm long, 60-70 µm in diam., cylindrical or obtusely conical, dark brown; ostiolar canal about 15 µm in diam., periphyses absent; walls of some necks extend into lumina of wood vessels and, thus, appear warty. Catenophyses: absent, center of immature ascomata filled with hyaline, thin-walled pseudoparenchymatous cells that become compressed by the developing asci. Asci: 70-80 x 12-14 µm, 8-spored, fusiform to clavate, unitunicate, thin-walled, early deliquescing, maturing simultaneously on a small-celled ascogenous tissue at the base of the ascomata venter. Ascospores: 50-72 x 4-5.5 µm, filiform, or rarely elongate fusoid, straight or curved, attenuate, thick-walled, non-septate, hyaline, without appendages. Asexual morph: Undetermined (Description based on Kohlmeyer (1977), and Borse et al. (2012)).


Key to species of Bathyascus:

  1. Ascospores 1-septate, 70-100 x 8-9 µm                                    B. tropicalis
  1. Ascospores non-septate                                                           2
  1. A deep sea species, 50-72 x 4-6 µm,                                        B. vermisporus 
  1. Intertidal species                                                                    3
  1. Ascospores 90-145 x 2.5-4 µm                                                B. avicenniae  
  1. Ascospores 205-300 x 9-15 µm                                               B. grandisporus
  1. Ascospores 125-160 x 2.5-5 µm                                              B. mangrovei


Key references:

Hyde KD, Jones EBG (1987) Marine fungi from Seychelles. VII. Bathyascus grandisporus sp. nov. from mangrove wood. Bot. Mar. 30: 413 416.

Jones EBG, Chatmala I, Pang KL (2006) Two new genera isolated from marine habitats in Thailand: Pseudolignincola and Thalespora (Halosphaeriales, Ascomycota). Nova Hedwigia 83: 219-232.

Kohlmeyer J (1980) Tropical and subtropical filamentous fungi of the Western Atlantic Ocean. Botanica Marina. 23(8):529-544.

Ravikumar DR, Vittal BPR (1991) A new species of Bathyascus from Indian mangroves. Mycological Research. 95(3):370-371.


Type & Location:
Other Specimens:
saprobic, on intertidal wood (deep sea).
India, USA. Both on wood in deep sea sediments
Pertinent Literature:
The genus is referred to the Halosphaeriaceae, but this has not been confirmed at the molecular level. Currently, five species are accepted primarily from tropical locations (Kohlmeyer 1980, Hyde and Jones 1987, Ravikumar and Vittal 1991). All need to be recollected, isolated and sequenced to resolve their taxonomic position. The genus resembles Thalespora but differs in that the ascospores lack polar appendages as described for Th. appendiculata (Jones et al. 2006). Jones et al. (2006) discuss this similarity as molecular data is available for Thalespora.


Mushroom Research Foundation 
Chiang Rai 


Sueggestions for improvement of the webiste, corrections or additions should be send to:

Gareth Jones: Email:

Mark Calabon: Email: