Freshwater Ascomycetes - Species Monograph
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| Genus |
Species |
Author |
| Pseudohalonectria |
falcata |
Shearer, C.A. |
| Class |
Order |
Family |
| Sordariomycetes |
Inc. sed. |
Magnaporthaceae |
Genbank ID:
45983
|
| Synonymy: |
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Description
|
| Habit: |
Saprobic, ascomata immersed on submerged, dead woody debris. |
|
| Ascomata: |
Ascomata 277-535 µm diam, immersed on wood, yellowish brown, membranous, rostrate, venter globose to subglobose. |
|
| Peridium: |
Peridium of textura angularis in face view, pseudoparenchymatic in longitudinal section with an outer covering of loosely interwoven hyphae. |
|
| Beak: |
Beaks 81-162 x 81-108 µm, cylindrical with rounded apex, light yellow or light brownish yellow, periphysate. |
|
| Hamathecium: |
Paraphyses 94-209 x 4.8-12 µm, septate, tortuous at first, with or without constrictions at the septa, of large thin-walled cells, attached to ascogenous hyphae. |
|
| Ascus: |
Asci 106-244 x 14.4-21.6 µm, unitunicate, hyaline, cylindrical to cymbiform, sometimes sigmoidal, with IKI-negative, flattened apical apparatus which stains bright blue in slightly acidic aqueous cotton blue, seperating from or remaining attached to ascogenous hyphae, containing eight ascospores in a single fascicle. |
|
| Ascospore: |
Ascospores 97-166 (x =135) x 4.2-7.2 (x =5.8) µm, 6 to 16 septate, hyaline, falcate, sometimes slightly sigmoid. |
|
| Sheath: |
None observed. |
|
| Appendage: |
None observed. |
|
| Culture: |
ATCC 56673. Colonies on cornmeal agar floccose, white at first, becoming yellow, yellow in reverse. Hyphae mostly immersed, hyaline to pale yellow, smooth walled, 1.5-3 µm diameter. |
| Anamorph: |
Unknown. |
|
Other info
|
| Type & Location: |
HOLOTYPE: USA. Illinois: Brown County, Illinois River at Beardstown, a culture fruiting on beechwood, derived from a single ascospore isolated from an ascoma on a submerged twig, CA Shearer, 7 Nov 1987, NY. |
| Other Specimens: |
USA: Illinois, Mason County, Quiver Creek, on submerged twig, CA Shearer, 10 Aug 1978, CS-617-1, NY. |
| Substratum: |
Wood debris. |
| Habitat: |
Lotic |
| Distribution: |
USA (IL) |
| Pertinent Literature: |
C.A. Shearer. 1988. 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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Hamathecium 2
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Ascospore 2
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