The pore fungus in the picture is a member of a large, common mushroom genus worth knowing, that of "the bolets," of the genus Boletus. One reason to know this genus is because it is common, and another is because many species in the genus are good to eat! This particular bolet, by the way, shows an important characteristic that some bolet species show. That is, its flesh "bruises blue." That dark splotch on the cap's top right is the "blue bruise." A few seconds before I pressed my thumb there, that area was yellow like the rest of the cap. Many bolet species do not bruise like that.