New Phytologist 184 (2009), 768–782
Since its publication, the authors of Allison & Hare (2009) have brought to our attention that there is an error in their article where some of the values for the number of tests in Fig. 1 are incorrect and are, therefore, inconsistent with the values noted in the text, which are correct. The correct Fig. 1 is printed below.
We apologize to our readers for this mistake.