How are Obregonia and  Trichodiadema different from each other?
Obregonia Obregonia, the artichoke cactus, is a genus of cacti with a single species, Obregonia denegrii. The species is endemic to the state of Tamaulipas in Mexico.
Tricholoma aurantium Tricholoma aurantium, commonly known as the golden orange tricholoma, is a mushroom of the agaric genus "Tricholoma". Originally described by Jacob Christian Schäffer in 1774, it was transferred to the genus "Tricholoma" by Adalbert Ricken in 1915.