Freshwater Ascomycetes - Species Monograph
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| Genus |
Species |
Author |
| Protoventuria |
myrtilli |
(Cook) Barr, Sydowia 41: 37. 1989 |
| Class |
Order |
Family |
| Dothideomycetes |
Pleosporales |
Venturiaceae |
|
| Synonymy: |
Basionym: Venturia myrtilli Cooke, J. Bot. (London) 4: 245. 1866. |
Description
|
| Habit: |
On Vaccinium macrocarpon, V. oxycoccus and Ledum groenlandicum. |
|
| Ascomata: |
Ascomata 70–84 x (47-) 52–70 µm, scattered or gregarious, ovoid, dark brown, with brown intramaterical hyphae, 2-4 µm thick. Subcuticular hyphae dark brown. Setae (40-) 55–60 x 4–6 µm, dark brown to black, non-septate, confined to upper portion of ascomata near ostiole, mostly geniculate, at times straight. |
|
| Peridium: |
Peridium 5.5–6.5 µm thick, composed of 1 or 2 layers of pseudoparenchymatic cells, of textura angularis or textura globosa in longitudinal section; cells 2.5–6 (-8) µm in diam., thick-walled, dark brown. |
|
| Beak: |
|
|
| Hamathecium: |
Pseudoparaphyses cellular, 1–2 µm thick, with gelatinous sheath not staining in India ink, deliquescing at maturity. |
|
| Ascus: |
Asci (38-) 44–50 x 6–8 µm, clavate, pyriform to obpyriform, fissitunicate, with 8 overlapping biseriate ascospores. |
|
| Ascospore: |
Ascospores 9.5–14 x 3.5–5.5 µm, elliptical to broadly clavate at the upper cell, upper cell at times slightly rhomboid, hyaline to light brown, faintly verruculose, with small guttules, 1-septate, constricted at the septum; septum median, ascospores forcibly discharged, provided with a thick gelatinous sheath. |
|
| Sheath: |
Thick ascospore sheath present. |
|
| Appendage: |
None observed. |
|
| Culture: |
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| Anamorph: |
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Other info
|
| Type & Location: |
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| Other Specimens: |
USA. WISCONSIN: Vilas Co., Crystal Bog, UTM Zone 16, 298235mE, 5098282mN, 46°00'422"N, 89°36'361W, on submerged dead leaves of Vaccinium macrocarpon and V. oxycoccus, 28 May 1996, PMF & JLC P5-16 (ILLS 54060); Trout Bog, UTM Zone 16, 292189mE, 5102049mN, 46°02'427"N, 89°41'146"W, on submerged dead leaves of Ledum groenlandicum, 14 Nov 1997, PMF & JLC P6-35 (ILLS 54059). |
| Substratum: |
Woody shrubs. |
| Habitat: |
Bog. |
| Distribution: |
North America (Wisconsin), Europe. |
| Pertinent Literature: |
Fallah & Shearer 2001. |
| Comments: |
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Additional Pictures
|
Fig. 1, Bar = 50 µm; Figs. 2 &3, Bar= 25 µm; Fig. 4, Bar = 50 µm; Fig. 5, Bar = 25 µm; Fig. 6, Bar = 5 µm.
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