Fragile candlestick algae
| Fragile candlestick algae | ||||||||||||
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Fragile candelabrum alga ( Chara globularis ) |
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| Scientific name | ||||||||||||
| Chara globularis | ||||||||||||
| Thuill. , 1799 |
The fragile candlestick algae ( Chara globularis , syn .: Chara fragilis ) is a fairly common representative of the candelabrum algae in nutrient-poor waters in Germany . It got its species name because of its fragile consistency after drying.
distribution
The fragile candlestick alga is represented cosmopolitan , but is found more frequently in the northern hemisphere. In Germany and Europe, the alga grows in oligotrophic to slightly eutrophic waters and prefers calcareous water. It is only rarely found in acidic waters, with sterile miserable forms then often appearing.
Identifying features
The fragile candelabra is very variable. In the literature, three habitually easily distinguishable forms are described:
- Normal form: The alga is long, robust, thick and richly fruity. It grows in its main distribution area in oligotrophic waters.
- Pioneering form: The alga is short, fine-branched, fragile and mostly grows in oligotrophic shallow waters.
- Flowing water shape: The alga is elongated, long-branched, often forms sterile oogonia (female egg buds) and grows in flowing water or deep water.
The length of the candelabrum can vary widely (between 10 and 120 centimeters). Their main shoot is about 0.3 to 1.4 mm thick. The regularly triple furrowed (triplostitch), finely striped bark has smooth furrows and nodal cells that are difficult to recognize. The end link, also without ribs, is often two-lined. The species has no spines (stipples), but only indistinct humps (stipulars). The internodes are longer than the branches that extend from them, 7 or 8 in a whorl on a stem. At the end of the shoot they are arched upwards like a funnel and often tapering to a point.
The fragile chandelier algae forms monoecular gametangia on barked knots that are at the base of the branches and are not compressed. The oogonia have about 15 whorls (coils) and small crowns that persist for a long time after ripening. The oospores are elongated, ellipsoidal, black and usually have 13 ribs.
nomenclature
The name Chara globularis was first coined by Jean Louis Thuillier in 1799. The name " Chara fragilis Desvaux , 1810" is also used in literature . According to the priority rule, the older name should be used. However, both names are used synonymously.
Web links
literature
Werner Krause, H. Ettl, G. Gärtner, H. Heynig, D. Mollenhauer: Freshwater flora of Central Europe. Volume 18: Charales (Charophyceae) . Gustav Fischer Verlag 1997, ISBN 3-437-25056-6