 The cap of G. cyanescens is initially convex , but flattens out in maturity , sometimes becoming shallowly depressed ; it reaches a diameter of 4 – 12 cm ( 1 @.@ 6 – 4 @.@ 7 in ) . The cap is dry , and ranges in color from buff to yellowish to pale olive , occasionally with darker streaks of color . Its surface is uneven , sometimes with wrinkles and pits . The cap margin is initially curved inward , and sometimes splits in maturity . The flesh is whitish to pale yellow , and has a brittle texture . On the underside of the cap , the pore surface is white to yellowish , sometimes with olive or tan tinges . There are roughly two circular pores per millimeter , and the tubes that comprise the pores are 5 – 10 mm ( 0 @.@ 2 – 0 @.@ 4 in ) deep , but depressed around the top of the stem . Injury to the pores will cause them to stain first greenish yellow , then greenish blue or blue . 
