Dungeon near under a swamp woth mushroom tree

I will repeat it one last time, As you see there is one mushroom tree there near a swamp there is no actual hole but I'm showing the fastes way to it once when you see a cobblestone check if its in a straight line near other cobblestone and when you do find it, thats the dungeon. With two chest, ps. The spawner is a spider spawner.