Lacto isn't yeast, but whatever. If you captured from an orange tree, it's almost guaranteed that you captured a variety of things. Some won't grow at all, and some will grow faster or earlier than others. In my experience, lacto doesn't form a continuous pellicle, but one composed of globules that look a lot like cottage cheese. Brett forms a more puffy-cloud type pellicle, which is more what yours looks like to me. People with more experience than me--there's plenty of you--can chime in here.
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