Morphology of ‘ S. philanthi biovar triangulum ’. (A) Differential interference contrast (DIC) micrograph of ‘S. philanthi biovar triangulum’ in an antennal sample. (B) FISH micrograph of the same area as shown in A, with the ‘S. philanthi’-specific probe Cy3-SPT177 (red), and DAPI for unspecifically staining bacterial DNA (blue). (C) FISH micrograph of a pure culture of ‘S. philanthi’ with Cy3-SPT177 (red) and DAPI (blue). (D) Colony of ‘S. philanthi’ grown on the solid Grace’s medium. (E, F) Scanning electron micrographs of aerial mycelium from matured ‘S. philanthi’ colonies grown on the solid Grace’s medium.