i just found something that looks like a pollen sack. my plants are 3rd week into flowering and allready have some nice looking buds. from a total of nine plants only one has this thing. it is situated on the middle of the plant. it has the same thing on top but there there are some white pistils coming out of it so i suppose its ok. but at the middle there is no trace of white pistil. only 4 of these thing (now there is only one cause i ripped the other 3 just in case) .