Freshwater Ascomycetes - Species Monograph
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| Genus |
Species |
Author |
| Annulatascus |
biatriisporus |
K.D. Hyde |
| Class |
Order |
Family |
| Sordariomycetes |
Inc. sed. |
Annulatascaceae |
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| Synonymy: |
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Description
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| Habit: |
Saprobic on submerged wood, immersed, solitary or gregarious. |
|
| Ascomata: |
Ascomata 195–325 µm high, 390–520 in diameter, immersed, solitary or gregarious; ellipsoidal, ostiolate, with a long neck. |
|
| Peridium: |
Peridium ca. 50 µm thick, brown-black, coriaceous, comprised of an inner layer of hyaline, thin-walled, elongate cells and an outer layer of dark textura angularis. |
|
| Beak: |
Neck ca 390 µm long, 100 µm in diameter, black, cylindrical ; periphysate. |
|
| Hamathecium: |
Paraphyses up to 4 µm wide at the base, filamentous, numerous, septate, hyaline and tapering distally. |
|
| Ascus: |
Asci 210–260 x 12–17 µm, 8-spored, long-cylindrical, with a short pedicel which tapers toa fine point, thin-walled, unitunicate, with a large apical ring 3–4 µm hig and 7–8 µm in diameter. |
|
| Ascospore: |
Ascospores 4–58 x 8–10 µm, overlapping uniseriate, fusiform with weakly swollen ends, 1-celled, hyaline, with a thin mucilaginous sheath. |
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| Sheath: |
Ascospore sheath thin irregular in shape, mucilaginous. |
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| Appendage: |
Not present. |
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| Culture: |
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| Anamorph: |
Not known. |
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Other info
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| Type & Location: |
Holotypus: AUSTRALIA; in Queenslandia septentrionali, Babinda, The Boulders, on submerged wood, Dec. 1991, K.D. Hyde 880, BRIP 21481. |
| Other Specimens: |
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| Substratum: |
Submerged wood. |
| Habitat: |
Lotic. |
| Distribution: |
Australia; Costa Rica |
| Pertinent Literature: |
Hyde, K.D. 1995. Nova Hedwigia 61: 119–140. |
| Comments: |
In the Costa Rican collection, asci were discharged intact from the ascomata and the asci discharged spores by dehiscence of the ascus from the ascus base. The asci also deliquesce leaving the large apical rings lying in heaps on the wood surrounding the ascomata. This behavior was not noted for the type specimen. |
Additional Pictures
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Apical rings remaining from asci discharged from the ascomata.
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Ascus apical ring.
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Ascus apical ring.
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Ascospores.
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Ascospores.
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Discharged ascus with ascus apical ring .
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Empty ascus showing back door ascus dehiscence and narrow extension of ascus base.
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