Plant or Parasite!

Recently I found some strange new plant species growing in the park. I am not sure what it is yet, but I am currently gathering data on it to try to ascertain it’s origin. It is a yellowish color, and has rigid, somewhat triangular shape. It’s possible it is the fruiting body of the plant, however I am afraid it might be a fungal parasite. If anyone one has any idea what this thing might be, please contact me immediately! I would definitely not want this unsightly plant spreading.