Roy Halling, Nigel Fechner, Mitchell Nuhn, Todd Osmundson, Kasem Soytong, David Arora, Manfred Binder, and David Hibbett. 2015. Evolutionary relationships of Heimioporus and Boletellus (Boletales) with an emphasis on Australian taxa including new species and new combinations in Aureoboletus, Hemileccinum, and Xerocomus. Australian Systematic Botany vol. 28: in press.
Here are the two other covers (click for full-size images), references are here.