Particle Type – Determines whether V-Ray particles, Phoenix particles, or Geometry Instances are used.
Particle Source – Specifies which emitter in the scene is used as a particle source. Supported sources are X-Particles Emitter, Thinking Particles Groups, MoGraph Matrix and Cloner objects, and Cinema 4D Emitter object. When an object is added to the list, the Image Added icons appear. The Image Added icon toggles the particle source on and off; it is enabled by default. The Image Added icon determines whether the object's children are included as particle sources. It is disabled by default.