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Keywords from Image Description:
Haeckel Melethallia. See fullsize image for index to numbers Pediastrum tetras Ehrenberg Ehrenberg Hegewald Ktzing Ehrenberg Ktzing Ktzing Turpin Meneghini Haeckel Haeckel Haeckel Haeckel non Ktzing preoccupied Ktzing Meyen Ktzing Meyen Haeckel Haeckel non Hassall preoccupied Haeckel Haeckel Haeckel Haeckel Haeckel Wartmann