This is one of the more commonly encountered agarics in the Hawaiian Islands,
found on sticks of various hardwoods in alien forests at all elevations.  The bright
yellow to yellowish orange pileus covered with short conic spines is unmistakable.
A nice accounting of C. asprata  was published by Redhead and Ginns in Canad. J. Bot.
58: 731-740, 1980.