| Date | Text | |
|---|---|---|
30 Nov 1823
Nathanael Pringsheim |
birth Nathanael Pringsheim Born 30 Nov 1823; died 6 Oct 1894 at age 70. German botanist who was one of the founders of the science of algology (study of algae). He made important discoveries in the morphology and physiology of plants, especially in the fields of reproduction and evolution. Pringsheim's observation of the formation of plant cells provided support for the belief, opposed by the German botanist Matthias Jakob Schleiden, that cells arise only by division of pre-existing cells. In 1868 Pringsheim and Julius von Sachs were the first to describe the specialized bodies in the cell cytoplasm called plastids. Pringsheim also was the first to demonstrate a case of apospory, (production of a sexual generation from an asexual generation without the intervention of spores), in the Thallophyta (e.g., algae, fungi). |
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