Is it possible to "ripen" mushrooms after it's picked? Quite recently my world was shaken when I learned that the common button mushroom and the much larger portabello mushroom are both the exact same species, Agaricus Bisporus, but at different stages of maturity. 

I've tasted both portabello mushroom and button mushroom and can noticeably taste that the portebello have a much fuller and developed flavor compared to the much milder button mushroom. 

Because the price of portabello are much higher than the button mushrooms, I was wondering if there was any way to ripen/mature these button mushrooms? I'm not expecting a tiny button mushroom to grow to palm size portabellos but is there any way to mature the button mushrooms so that it has a fuller flavor?

Note that the mushrooms marketed as baby portabello mushrooms (button mushroom with a light brown hue) are the same as the button mushrooms. In fact they are the original button mushrooms. The common white button mushroom is a mutated variety that has been propagated due to its desirable white coloring. So baby portabello mushrooms are not "ripen" white button mushrooms.

EDIT: In reponse to the comments, I would like to clarify that I want to know if there is a way to "ripen" the flavor of the mushroom similar to how fruits can ripen after its already been picked. The color is irrelevant. The only reason I mentioned "baby portabello" is to make it clear that I know it exist and that isn't the answer I am looking for.
You can not ripen mushrooms after they've been picked because once they are removed they are disconnected from the mycelium which acts as the mushrooms "brain". Once picked they soon die off. You can only slow that process by cleaning them and keeping them at cool temperatures.