Japanese algae botanical illustrations

Biology was always my favourite of the sciences when in high school. I think in part it might have been exploring the natural world in depth, and the beauty in scientific illustrations. I came across these detailed illustrated studies of various algae and seaweeds from the book Icones of Japanese algae by Okamura Kintaro, 1867-1935. I love the composition, the gentle shading, and the details of the illustrations, such as close up diagrams of cell structures.