Hello, I'm a succulent collector. I see people online posting pictures of their plants and they often indicate the source, ie., who they got the plants from, prefixed with an 'Ex.' I tried looking online and I have no idea where this abbreviation comes from. Latin 'ex' with no dot, used in complex author names, seems to me to be a different thing. Some collectors claim that they maintain specimens directly cloned from field specimens and add the locality details to the plant description. I was wondering if there are in fact conventions for referring donor and locality relative to live plants and in that case, where it can be found online. Thanks.