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LM image scalebar = 10 µm = pixels not measured
Observations
| Observations: | Bart Van de Vijver |
|---|---|
| Length: | 13-18µm |
| Width: | 4-5,5µm |
| Striae: | Transapical striae 30 in 10µm in the median part; 40 striae in 10µm towards the ends |
Description:
Valves elliptical to linear-lanceolate, the median part with parallel borders, cuneate endings (L 13-18µm, W 4-5,5µm). Transapical striae 30 in 10µm in the median part, slightly radiate, 40 striae in 10µm towards the ends. RV: raphe filiform with internally central terminals curved in opposite directions, narrow axial area. Central area very wide, extending towards both sides. ARV: longitudinal area very narrow with rounded central part. The middle striae radial but larger and more spaced than the other striae.
| Morphology: | Monoraphid |
|---|---|
| Distribution: |
Autecology:
Notes:
Mostly found on relatively dry, acid soils without much vegetation cover. In mosses and open waterbodies, no observations were made although on South Georgia, it seems quite common on wet, submerged mosses (Van de Vijver & Beyens 1997a).Originally described from southern Chile (Krasske 1939), Kerguelen (Le Cohu & Maillard 1983) South Georgia (Van de Vijver & Beyens 1996, 1997a), South Shetland Islands (Björck et al. 1991), South Orkney Islands (e.g. Jones et al. 1993).A. stauroneioides f. striata Maillard should be considered as a younger synonym of Psammothidium incognitum. Although Lange-Bertalot & Krammer (1989) considered P. stauroneioides (Manguin) Bukht. & Round also to be a regional variation of P. incognitum due to similarities of the raphid valve, the latter should be kept as a separate species based on the structure of the araphid valve. Both Le Cohu & Maillard (1983) and Oppenheim (1994) gave sufficient arguments for this theory.
Other sites with Psammothidium incognitum
- Ile de la Possession (moist habitats), Crozet Archipelago
Original Type Description
| Author: | Krasske 1939 |
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| Length: | |
| Width: | |
| Striae: |
Original Description:
New combination
| Author: | Van de Vijver |
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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).
