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
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Synonymy: |
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Description
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Habit: |
Ascomata on wood submerged in freshwater streams. |
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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. |
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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. |
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Beak: |
Neck 52–55 x 63–67 µm, central, tapered towards the apex; periphyses not observed. |
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Hamathecium: |
Pseudoparaphyses 2–3 µm wide, septate, slightly constricted at the septa, hyaline, anastomosing above and among the asci. |
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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. |
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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 |
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Sheath: |
Sheath with protuberances at the ends and along the ascospore, appearing wavy in outline. |
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Appendage: |
None present. |
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Culture: |
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Anamorph: |
None observed. |
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Other info
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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: |
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Additional Pictures
Ascospore Sheath
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Pseudoparaphyses
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Broad stoloniferous hyphae.
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Endoascus apex.
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Endoascus apex.
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Ascospore.
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Ascospore.
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