Yellow Fungus in Houseplant Pot: Harmless Saprophyte

Observation

Bright yellow growth in philodendron pot. Never seen before. Will it kill plant?

Identification

• Myriad soil fungi fruit in organic-rich potting mix.
• Yellow = likely Leucocoprinus birnbaumii (flowerpot parasol) or slime mold.
• Saprophytes: Decompose dead organic matter only.
• Do not attack living plant roots.

Action

• Physically remove (spoon out) if unsightly.
• No fungicide needed.
• Some are quite beautiful—enjoy the biodiversity!

When to Worry

Only if plant shows decline (yellowing, wilting) → then root rot possible. Yellow fungus alone = harmless.