Brightfield microscopic image of cells of the liverwort species Calypogeia azurea containing green chloroplasts and blue oil bodies. The blue color of the oil bodies is caused by compounds such as 1,4-Dimethyl-azulene (SMILES: CC1=CC=CC=C2C1=CC=C2C) and other aromatic hydrocarbons and sesquiterpenoids (Tazaki et al 1998, doi:10.1016/S0031-9422(97)00751-6). The photo was taken adapting a Canon EOS RP camera to the Zeiss Axio Scope A1 microscope using a Neofluar 40x objective in brightfield.
<a href="//commons.wikimedia.org/wiki/User:Fabelfroh" title="User:Fabelfroh">Kristian Peters</a>
<span class="int-own-work" lang="en">Own work</span>