An arrangement of four Grammatophora robusta from Palos Verdes, California, USA. No makers name, but based on the style and handwriting I think this is by JA Long. Olympus BHB microscope using 450nm LED light. 40x Leitz Pl Apo 1.00 objective, oil immersion. Olympus Aplanat Achromat condenser, oil immersion, oblique lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 49 images stacked in Zerene (Pmax).
Grammatophora robusta Ehrenberg 1873. Published in: Ehrenberg, C.G. (1873). Mikrogeologische Studien über das kleinste Leben der Meeres-Tiefgründe aller Zonen und dessen geologischen Einfluss. Abhandlungen der Königlichen Akademie der Wissenschaften zu Berlin, Physikalische Klasse 1872: 131-398, 12 pl., tables 1-3. Page 261, no figure. The taxonomic or nomenclatural status (or both) of this entity is in some way unresolved and requires further investigation (as of October 2025).