A selection of Asteromphalus heptactis (called Asterolampra heptactis on the slide). No makers name or location, but it does say ‘Guano’ so presumably was extracted from guano. Olympus BHB microscope using 450nm LED light. 63x Leitz Pl Apo 1.4 objective, oil immersion. Olympus Aplanat Achromat condenser, oil immersion, oblique lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 65 images stacked in Zerene (Pmax).