Of the 12 red mushrooms, 2/3 had spots, for a total of (2/3)*12=<<2/3*12=8>>8 white-spotted mushrooms.
Of the 6 brown mushrooms, 100% had spots, for a total of (100/100)*6=<<6*100/100=6>>6 white-spotted mushrooms.
Of the 14 green mushrooms, 0% had white spots, for a total of 14*0=<<14*0=0>>0 white-spotted mushrooms.
And of the 6 blue mushrooms, half had spots, for a total of (1/2)*6=<<6*1/2=3>>3 white-spotted mushrooms.
In total, they gathered 8+6+0+3=<<8+6+0+3=17>>17 white-spotted mushrooms.
#### 17