Freshwater Ascomycetes - Species Monograph
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| Genus |
Species |
Author |
| Pseudohalonectria |
adversaria |
C. A. Shearer |
| Class |
Order |
Family |
| Sordariomycetes |
Inc. sed. |
Magnaporthaceae |
MycoBank ID:
136210
|
| Synonymy: |
|
Description
|
| Habit: |
Saprobic, ascomata immersed or partially immersed in submerged, dead woody debris. |
|
| Ascomata: |
Ascomata 445-614µm diam, solitary to clustered, superficial or immersed, globose, orange brown, membranous, rostrate. |
|
| Peridium: |
Outer wall layer of peridium brownish orange, of textura angularis in surface view, inner layer pseudoparenchymatic, light orange. |
|
| Beak: |
Beaks 79-248 x 109-158 µm, cylindrical, periphysate. |
|
| Hamathecium: |
Paraphyses septate, 133-230 µm long, 4-7.8 µm wide at base, tapering to a rounded point, attached to ascogenous hyphae. |
|
| Ascus: |
Asci 120-150 x 13-20 µm, unitunicate, containing eight ascospores in two overlapping fascicles of four, hyaline to pale orange, cylindrical or clavate, with IKI negative, cotton blue positive apical apparatus 2.5-5 x 2.5-3 µm, apex indented at apical pore, separating from ascogenous hyphae and lying free in venter cavity. |
|
| Ascospore: |
Ascospores 33.5-49 (x= 4l.9) x 4.5-7 (x= 5.9) µm, hyaline to pale orange, orange in mass, ellipsoidal, 5, occasionally 6 or 7 septate. |
|
| Sheath: |
None observed. |
|
| Appendage: |
None observed. |
|
| Culture: |
ATCC, Colonies on cornmeal agar floccose, with regular margin, aerial hyphae white, immersed hyphae creamy yellow, reverse dull yellow. |
| Anamorph: |
Not seen. |
|
Other info
|
| Type & Location: |
USA: Illinois, Johnson County, Deer Pond (Elvira Cypress Swamp), dried culture derived from a single ascospore from an ascoma on submerged wood and grown on alfalfa stems. CS 603-1, C. A. Shearer, 8 Aug 1977. NY |
| Other Specimens: |
|
| Substratum: |
Wood |
| Habitat: |
Lentic (swamp) |
| Distribution: |
USA (Il). |
| Pertinent Literature: |
Shearer, C.A. 1989. Pseudohalonectria (Lasiosphaeriaceae), an antagonistic genus from wood in freshwater. Canadian Journal of Botany 67: 1944-1955. |
| Comments: |
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Additional Pictures
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Ascus
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Ascus
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