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Freshwater Ascomycetes - Species Monograph

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Genus Species Author
Jahnula potamophila K. D. Hyde and S. W.
Class Order Family
Dothideomycetes Jahnulales Inc. sed.

Genbank ID: 741136       MycoBank ID: MB460478

Synonymy:

Description

Habit: Ascomata on wood submerged in freshwater streams. Jahnula potamophila - Habit
Ascomata: Ascomata 445–455 x 410–427 µm, globose to subglobose, scattered, immersed to partially immersed in wood, hyaline, with subtending, and superficial, stoloniferous brown hyphae ca. 30 µm wide, ostiolate, papillate. Jahnula potamophila - Ascomata
Peridium: Peridium about 50–58 µm wide, textura angularis in surface view; in longitudinal section, 4–6 cell layers thick, innermost layer of hyaline, thin walled, compressed cells 22–24 µm diam., outermost layer of large, moderately thick-walled angular cells 25–30µm diam. Jahnula potamophila - Peridium
Beak: Neck 52–55 x 63–67 µm, central, tapered towards the apex; periphyses not observed.
Hamathecium: Pseudoparaphyses 2–3 µm wide, septate, slightly constricted at the septa, hyaline, anastomosing above and among the asci. Jahnula potamophila - Hamathecium
Ascus: Asci 218–220 x 30–38 µm, fissitunicate, broadly cylindrical, pedicellate, with an apical chamber, and eight ascospores, which are 2-3 seriate at the base and uniseriate towards the ascus apex. Jahnula potamophila - Ascus
Ascospore: Ascospores 48–60 x 20-26 µm, one-septate, broadly ellipsoidal-fusiform, light brown to brown, multiguttulate, with a gelatinous sheath surrounding the entire ascospore Jahnula potamophila - Ascospore
Sheath: Sheath with protuberances at the ends and along the ascospore, appearing wavy in outline. Jahnula potamophila - Sheath
Appendage: None present.
Culture:
Anamorph: None observed.

Other info

Type & Location: Australia, north Queensland, near Cairns, Crystal Cascades, on submerged wood, Jan. 1992, K.D. Hyde (HKU(M) 886.
Other Specimens: Costa Rica: Heredia, La Selva Biological Station, Salto A60, 10°24'43''N, 84°1'0''W, UTM Zone 16, 826666mE, 1152499mN, water temperature 26 C, pH 5.5, on submerged, decorticated wood, 17 May 2000, JLA and RW, A420-1, ILL; Piper, on submerged decorticated wood, 6 February 2001, CMP, A420-2, ILL. Known distribution. Australia, Costa Rica.
Substratum: Submerged wood.
Habitat: Lotic habitats in the tropics.
Distribution: Australia, Costa Rica, USA (FL)
Pertinent Literature: Hyde, K.D. 1992. Tropical Australian Freshwater Fungi. I. Some Ascomycetes. Aust. Syst. Bot., 5: 109–116. Raja, H.A. and C.A. Shearer. 2006. Jahnula species from North and Central America, including three new species. Mycologia 98: 319–332; Raja 2007
Comments:

Additional Pictures

Ascospore Sheath Jahnula potamophila - additional image
Pseudoparaphyses Jahnula potamophila - additional image
Broad stoloniferous hyphae. Jahnula potamophila - additional image
Endoascus apex. Jahnula potamophila - additional image
Endoascus apex. Jahnula potamophila - additional image
Ascospore. Jahnula potamophila - additional image
Ascospore. Jahnula potamophila - additional image

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