Opsin three domains of life: Archaea, Bacteria, and Eukaryota. In Eukaryota, type I opsins are found mainly in unicellular organisms such as green algae, and in fungi. In most complex multicellular eukaryotes, type I opsins have been replaced with other light-sensitive molecules such as cryptochrome and phytochrome in plants, and type II opsins in Metazoa (animals). Microbial opsins are often known by the rhodopsin form of the molecule, i.e., rhodopsin (in the broad sense) = opsin + chromophore. Among the many kinds of microbial opsins are the proton pumps bacteriorhodopsin (BR) and xanthorhodopsin (xR), the chloride pump halorhodopsin (HR) the photosensors
John Lightfoot (biologist) "Ryssus", but including also "Lichen" as "Algae Terrestres", terrestrial algae. Only nine genera of fungi are recognised in the book: "Agaricus", "Boletus", "Hydnum", "Phallus", "Helvella", "Peziza", "Clavaria", "Lycoperdon", and "Mucor" (listed on page 645); a tenth fungal genus, "Tremella" is covered, but included among his algae. "Scottish Fungi" note that "While his classification might be a bit wonky by today's understanding, most of the species he recorded can be traced to modern taxa", and that he provided the first British records for the chanterelle and the summer truffle. The book has an "English and Scotch Index of the Names of