 The fruit body of Suillus collinitus is a medium to large , fleshy bolete . The cap is initially rounded , becoming convex and finally flat , reaching up to 11 cm ( 4 @.@ 3 in ) in diameter . The cap is covered with a brown cuticle of variable shade that is decorated with minuscule radial striations , which become more obvious in fully expanded specimens and especially in dry weather . The cap is often shaped irregularly and becomes viscid ( sticky ) when damp . The tubes are short and their stem attachment is usually slightly decurrent to adnate . The small and angular pores are yellow but darken with age . Young , fresh specimens sometimes bear droplets of a clear fluid that collect on the pore surface . 
