During our heat wave days, I notice Ficus maclelandii 'Alli' grows out its new leaves crinkly curly..but eventually straightens out as temps improve. For awhile I thought it was reacting when I moved it to a shadier spot..but it repeated it again coinciding with our heat wave days.
Last Aug 8, 2014 high temps at this time between 90 to 94F
Sept 15, 2014 high temps at this time, since over the weekend, 96 to 100F