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Observations
| Observations: | Bart Van de Vijver |
|---|---|
| Length: | 60-85µm |
| Width: | 13-15µm |
| Striae: | 10-11 striae in 10µm |
Description:
Valves rhombic-lanceolate with convex sides and broadly rounded, weakly truncate ends (L 60-85µm, W 13-15µm, 10-11 striae in 10µm). Axial area linear-lanceolate, widening towards the central area. Central area rhombic to rhombic-elliptical. No fascia present. Raphe lateral with large, bent, central pores and bajoneT-shaped terminal fissures. Transapical striae radiate in the middle, convergent towards the poles. No longitudinal lines.
| Morphology: | Naviculoid |
|---|---|
| Distribution: |
Autecology:
Notes:
Rare in relatively dry (<50%), acid soil samples with higher chloride contents. Almost absent in moss and freshwater samples.Kerguelen (Bourrelly & Manguin 1954, Larson 1974), South Georgia (but probably this is the variety ventricosa, Van de Vijver & Beyens 1996, 1997a).This taxon bears a large similarity with P. decrescens var. ventricosa (Hustedt) Krammer but is a lot larger (60-85µm vs. 55-68µm) with less striae in 10µm. Reported in Van de Vijver & Beyens (subm.) as P. divergens var. decrescens (Grunow) Krammer (smaller valves) and P. krasskei var. ventricosa Hustedt (larger valves).
Other sites with Pinnularia decrescens var. kerguelenensis
- Ile de la Possession (moist habitats), Crozet Archipelago
Original Type Description
| Author: | Manguin 1954 |
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| Length: | |
| Width: | |
| Striae: |
Original Description:
New combination
| Author: | Van de Vijver & Le Cohu |
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Citations
Index Nominum Algarum (INA):
- Original
- If an INA link is available, it will be shown above
- The INA is a bibliographic reference "card file" for algal taxonomy, containing nearly 200,000 names of algae (in the broad sense).
