Freshwater Ascomycetes - Species Monograph
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| Genus |
Species |
Author |
| Ascosacculus |
heteroguttulatus |
(S.W. Wong, K.D. Hyde & E.B.G. Jones) J. Campb., J.L. Anderson & Shearer |
| Class |
Order |
Family |
| Sordariomycetes |
Halosphaeriales |
|
Genbank ID:
173432
|
| Synonymy: |
Basionym: Halosarpheia heteroguttulata S.W. Wong, K.D. Hyde & E.B.G. Jones Can. J. Bot. 76: 1858, 1998. |
Description
|
| Habit: |
Ascomata on woody debris submerged in freshwater |
|
| Ascomata: |
Ascomata 112–168 µm in diameter, globose to subglobose, superficial to slightly immersed, brown, membranous, ostiolate with neck. |
|
| Peridium: |
Peridium 14–19 µm thick, composed of several layers of elongate, thin-walled, lightly pigmented pseudoparenchyma. |
|
| Beak: |
Neck 44 x 48 µm long, 24µm wide, light brown at the apex, brown below. |
|
| Hamathecium: |
Hamathecium of catenophyses. |
|
| Ascus: |
Ascus 44 x 18 µm (n=1, immature), lacking an apical apparatus, thin-walled, containing eight ascospores, deliquescing early. |
|
| Ascospore: |
Ascospores 26–34 (-36) x 6–8 µm (27–37 x 9–17.5 µm in Wong et al. 1998), ellipsoidal, hyaline, one septate, one cell containing 1–2 large guttules, the other with numerous small guttules, with bipolar, unfurling appendages. Ascospores develop a second septum in the upper cell during germination. |
|
| Sheath: |
No sheath observed. |
|
| Appendage: |
Appendages bi-apical, coiled to form hamate structures that unfurl in water to form very long fine threads. |
|
| Culture: |
Colonies on PYG agar black, brownish black in reverse, with no diffusible pigments; hyphal growth compact, mostly submersed in the medium. |
| Anamorph: |
Trichocladium sp. |
|
Other info
|
| Type & Location: |
AUSTRALIA: North Queensland, Crystal Cascades, on submerged wood in small river, 28 Apr. 1996, T.M. & K.D. Hyde (HKU(M)2806). |
| Other Specimens: |
See Anderson & Shearer 2002. |
| Substratum: |
On submerged woody debris. |
| Habitat: |
Lotic and lentic freshwater habitats. |
| Distribution: |
Australia, Brunei, Hong Kong, Mauritius, Philippines, South Africa, USA (FL, TN) |
| Pertinent Literature: |
Wong et al. 1998; Anderson & Shearer 2002. |
| Comments: |
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Additional Pictures
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Immature asci.
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Anamorph.
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