Fic. 53.—Raoulia lutescens, a low cushion-plant which forms a seed-bed for other 
plants in the development of low tussock-grassland. 
Trans. N.Z. Inst.] [Photo, C. E, Foweraker. 
Fie. 54.—Cushion of the green raoulia (Raoulia Haastii) with tussock-grass 
settled on it. Bed of the River Cass. 
Trans. N.Z. Inst.j [Photo, C. E. Foweraker. 
