A new variety of Nitzschia sinuata (W. Sm.) Grun. from North Wales,Great Britain

Summary A new taxon, Nitzschia sinuata, var. denticuloides, var. n. was found to occur sparingly in two freshwater springs of Newborough Warren, Anglesey, North Wales, Great Britain. These two springs were characterized by shallow waters, moderate temperature and high pH. Dysharmonious or idiotrophic nature of the water was evident from high calcium, sodium and chloride contents, as well as low phosphate and potassium contents. The algal community was found to be dominated by Cladophora fracta (Dillw.) Kuetz. bearing a vast population of epiphytic diatoms such as Epithemia and Achnanthes species.

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Zusammenfassung Eine neue Kieselalge, Nitzschia sinuata, var. denticuloides, var. n., ist in zwei Süsswasserquellen in Newborough Warren, Anglesey, Nord Wales, Grossbritannien spärlich verbreitet entdeckt worden. Diese beiden Quellen sind durch seichtes Wasser, milde Temperaturen und hohen pH Wert gekennzeichnet. Hohe Kalcium, Sodium und Chlorid Werte und niedrige Phosphat und Kalium Werte beweisen den dysharmonischen oder idiotrophen Charakter des Wassers. Die Algengesellschaft bestand hauptsächlich aus Cladophora fracta (Dillw.) Kuetz., dicht besetzt von epiphytischen Diatomeen wie Epithemia and Achnanthes Arten.