Cycles artifacts with alpha materials

I am working on this scene with trees which the branches and pine needles are a plane with alpha setup in the material. They look fine until it overlaps with other trees with the same material. Does anyone know a solution to get rid of the black artifacts I am seeing here? Thanks.



Sometimes such issues disappear when increasing the number of bounces, especially transparency:

That was my immediate thought, too. Nothing to do with the material setup, and almost certainly to do with the transparency bounces.

To confirm, do a render with one transparency bounce, and you will see an awful lot more black.

Yeah, I was suggesting trying more bounces.

I know. I suggested fewer because it proves the issue. Once proved, then increase to the appropriate number (whatever works).

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Changing the transparency bounces totally solved my issue. Thank you so much for taking time to respond to my question.

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