sentences:  Like other boletes, "B. aereus" has tubes extending downward from the underside of the cap, rather than gills; spores escape at maturity through the tube openings, or pores.The pore surface of the fruit body is whitish when young, but ages to a greenish-yellow.The squat brown stipe, or stem, is up to 15 cm (6 in) tall and thick and partially covered with a raised network pattern, or reticulation.