"Exploring the Intricate Beauty of Algae: From Ernst Haeckel's Art of Diatom Algae to 19th-Century Cyanotypes" Discover the mesmerizing world of algae, as we delve into its diverse forms and captivating allure. Ernst Haeckel's stunning illustrations in "Art of Diatom Algae" showcase the intricate patterns and delicate structures that make these organisms so fascinating. Algues - algae, a term encompassing various species, offer a glimpse into the wonders of marine life. Pressed seaweed specimens C016 / 6127 provide tangible evidence of their existence, preserving their beauty for generations to appreciate. Transporting us back in time, a 19th-century alga cyanotype captures the essence of these ancient organisms. The blue hues evoke a sense of tranquility while reminding us of algae's enduring presence throughout history. Calcareous phytoplankton observed through scanning electron microscopy (SEM) reveals their microscopic intricacies. These tiny calcified organisms play an essential role in marine ecosystems, contributing to both biodiversity and carbon cycling. In the enchanting realm beneath the waves, witness the remarkable sight of a male weedy seadragon carrying eggs through a kelp forest. This awe-inspiring display showcases how algae serves as vital habitat and nourishment for countless marine creatures. Discosphaera tubifera, a coccolithophore with its ornate structure visible under SEM, highlights nature's ability to create intricate masterpieces on even microscopic scales. Such marvels remind us that beauty exists at every level within our natural world. Returning to cyanotypes from Anna Atkins' collection dating back to ca. 1853, we are reminded once again how early pioneers recognized and celebrated algae's aesthetic appeal long before it gained scientific recognition. From Dictyota dichotoma's elegant fronds swaying gently underwater to diatoms observed under SEM revealing their geometric precision, algae showcases the diversity and resilience of plant life in aquatic environments.