Black tree was removed from RuneScape after an update.

Black tree

Members only?	No
Woodcutting level	40
Woodcutting experience	0
Logs	Black logs
Farming level	Cannot be farmed.
Farming experience	Cannot be farmed.
Examine	This tree can be cut for wood worth 5 resource points.

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Black trees were found on the east island in the Resource Race event of the Gielinor Games. Two of them were present. They yielded 3 to 5 black logs before being chopped down. They required 40 Woodcutting to cut.