Fig. 59. Replacement of tussock-grassland by cushions of Raoulia lutescens — the cushion-form being due to the original mat being filled with sand — near Tarras (North Otago district) owing to denudation by drifting sand. — Photo. L. Cockayne
Fig. 59. Replacement of tussock-grassland by cushions of Raoulia lutescens — the cushion-form being due to the original mat being filled with sand — near Tarras (North Otago district) owing to denudation by drifting sand. — Photo. L. Cockayne.