Nigel Cattlin / Bacterial shot hole (Pseudomonas syringae) affected leaves of laurel, Prunus laurocerasus, in a garden hedge, Berkshire, England, UK. May.

Andres M. Dominguez / Bacteria (Lepthotryx discophora) causing iridescent patterns and White willow tree leaf (Salix alba) in river, Sierra de Grazalema Natural Park, southern Spain, November.

Nigel Cattlin / Broad bean (Vicia faba) roots with root nodules formed by Bacteria (Rhizobium sp) for nitrogen fixation.

Nigel Cattlin / Creeping thistle (Cirsium arvense) with chlorosis caused by PST bacteria (Pseudomonas syringae pv tagetis). Dorset, England, UK. October.

Nigel Cattlin / Creeping thistle (Cirsium arvense) with chlorosis caused by PST bacteria (Pseudomonas syringae pv tagetis). Dorset, England, UK. October.

Nigel Cattlin / Creeping thistle (Cirsium arvense) with leaf chlorosis caused by Bacteria (Pseudomonas syringae pv tagetis). Berkshire England, UK. June.

Jean E. Roche / Ribbons of Filamentous bacteria (Beggiatoa sp.) Salin de Giraud, Camargue, France.

Andres M. Dominguez / Bacteria (Leptothryx discophora) causing iridescent sheen on water surface with White willow leaf (Salix alba). Sierra de Grazalema Natural Park, southern Spain, November.

Andres M. Dominguez / Bacteria (Leptothryx discophora) causing iridescent sheen on water surface with White willow leaf (Salix alba). Sierra de Grazalema Natural Park, southern Spain, November.

Will Watson / Sheep droppings coated with Sphaeotilus natans, a saprotrophic bacteria referred to as 'sewage fungus' in a pond, Wales, UK, September

Nigel Cattlin / Bacterial shot hole (Pseudomonas syringae) affected leaves of laurel (Prunus laurocerasus) in a garden hedge, May Berkshire, England, UK.

Nigel Cattlin / Bacterial shot hole (Pseudomonas syringae) affected leaves of Laurel (Prunus laurocerasus) in a garden hedge, May Berkshire, England, UK.