Freshwater Ascomycetes - Species Monograph
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| Genus |
Species |
Author |
| Phaeosphaeria |
barriae |
Fallah, C.A. Shearer & J.L. Crane |
| Class |
Order |
Family |
| Dothideomycetes |
Pleosporales |
Phaeosphaeriaceae |
|
| Synonymy: |
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Description
|
| Habit: |
Ascomata scattered, immersed, becoming erumpent on submerged dead herbaceous debris. |
|
| Ascomata: |
Ascomata 296-308 x 211-230 µm, pyriform, scattered, immersed becoming erumpent, papillate, ostiolate, dark brown. |
|
| Peridium: |
Peridium thin-walled, 12-42 µm wide, of 3 to 4 layers of small pseudoparenchymatic cells; cells 12-19.5(-23) x 4-6 µm, outer cell layers brown, inner cell layers hyaline, textura angularis in face view and in longitudinal section. |
|
| Beak: |
Beak 78-121 µm long, periphysate. Wall composed of small rounded cells, 6-8(-10) x 4-6 µm, wall thicker at the apex. |
|
| Hamathecium: |
Pseudoparaphyses cellular, 1-2 µm wide. |
|
| Ascus: |
Asci 152-183 x 25-35 µm, clavate, slightly curved toward the base, fissitunicate, with small occular chamber, wall thicker at the apex, tapering to a short hoof-shaped stipe at the base, with 8 overlapping biseriate ascospores. |
|
| Ascospore: |
Ascospores 47-55 x 10.5-ll.5(-13) µm, broadly fusiform, hyaline, straight or slightly curved, 3-septate, constricted more at the primary septum and less at the other septa, with middle two cells equal in size and larger than end cells, 15.5-16 x 10.5-12 µm; end cells, 10-11 x 7-8 µm, with a single guttule in each cell. |
|
| Sheath: |
Amorphous gelatinous sheath surrounding the ascospore, at first contained within rigid end caps that slip off in water. End caps 10-12 µm dian, not staining in India ink and invisible in lactic acid. Sheath penetrated by bipolar appendages which are initially coiled and unfurl in water. Appendages invisible in lactic acid. |
|
| Appendage: |
None observed. |
|
| Culture: |
Colonies on peptone yeast extract agar (PYG) grown at 24 C pink. Mycelium immersed in agar composed of branched, septate, hyaline hyphae. Aerial hyphae white and formed at the center of colonies. Culture from the holotype, ATCC 201490. |
| Anamorph: |
Not seen. |
|
Other info
|
| Type & Location: |
HOLOTYPE. USA. WISCONSIN: Vilas Co., Big Muskellunge Lake, UTM Zone 16, 297663mE, 5097935mN, on Typha latifolia L., 28 Oct 1995, PMF P3-38 (ILLS 53092). |
| Other Specimens: |
ILLS |
| Substratum: |
Carex, Scirpus, Typha |
| Habitat: |
Lotic |
| Distribution: |
USA (WI) |
| Pertinent Literature: |
Fallah, P.M., C.A. Shearer, and J.L. Crane. 1998. Freshwater Ascomycetes: Phaeosphaeria barriae sp. nov. from lakes in Wisconsin. |
| Comments: |
P.M. Fallah is acknowledged for the discription and illustrations. |
Additional Pictures
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Unfurled Appendages
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Appendages Inside Sheath
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Unfurled Appendages
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Appendages In India Ink
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Ascospores With Appendages
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Ascus Apex
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Endoascus
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Empty Ectoasci
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Peridial Cells
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Sheath In Early Stage Of Expansion
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Expanded Sheath Outlined In India Ink
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Ascospore In Expanded Sheath
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