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Old 05-23-2013, 02:56 AM
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I have had a few plants in my collection over the years with either that fungus or one very similar. The black marks will always stay there until it drops the leaf. If it is left untreated, others will get it. Unlikely to ever kill a catt even if untreated but it looks bad.

On the bright side, it is very slow growing and probably more like a mould.
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