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Message: <blockquote data-quote="MBullock" data-source="post: 217303" data-attributes="member: 33994"><p>the yellow stuff is actually often leucocoprinus birnbaumii mycelium, it likes to grow on dead wood and anything organic and rotted.  Leucocoprinus is very common in potted soil and is often called "Potted plant parasols" because it generally hitch-hikes in peat moss.  It's generally only seen from spring-summer as it's tropical in nature and doesnt grow fast in cold temps</p></blockquote><p></p>