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Observations
| Observations: | Bart Van de Vijver |
|---|---|
| Length: | diameter 4-11µm |
| Width: | height 4-5µm |
| Striae: |
Description:
Cells cylindrical, forming short chains (Diameter 4-11µm, mantle height 4 5µm). Short collar present. Areolae on the mantle arranged in almost parallel, straight rows. Valve face covered with randomly distributed areolae. All valves found with a complete covering of the valve face. Deep ringleist present. Spines are observed on the margins of all valves, sometimes broken. Spines may be bifurcate or with expanded top, situated between two rows of areolae.
| Morphology: | Centric |
|---|---|
| Distribution: |
Autecology:
Notes:
A. distans is found mostly in samples from lakes and larger pools with low specific conductance values (60-140µS/cm) and slightly acid to circumneutral pH-values (6-7,2). Records from soils are scarce and relative frequencies do not exceed 3%. In moss vegetation, A. distans is observed in very wet, floating mosses. No records from dry mosses.King George Island (Opalinski 1972), South Georgia (Van de Vijver & Beyens 1996, 1997a), Kerguelen (Bourrelly & Manguin 1954, Van de Vijver et al. 1998a, 2001), Crozet (Pierre 1977).Due to the variable appearance of the spines, the taxon has been misidentified by Van de Vijver & Beyens (1999a) as A. alpigena (Grunow) Krammer. A thorough examination and comparison justifies however the identification as A. distans. Detailed information regarding the morphology of A. distans can be found in Crawford & Likhoshway 1999).
Other sites with Aulacoseira distans
- Ile de la Possession (moist habitats), Crozet Archipelago
Original Type Description
| Author: | Ehrenberg |
|---|---|
| Length: | |
| Width: | |
| Striae: |
Original Description:
New combination
| Author: | Simonsen 1999 |
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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).
