Moldstool

The Moldstool is a Boss Enemy appearing in Pikmin: Other Frontier. It is a close relative to the Puffstool even sharing the same body structure, but while Puffstools have smooth red caps Moldstools have warty green caps.

One is the boss of the final sub level of Spoiled Mound, however, it is more similar to the Giant Breadbug as it doesn't attack directly, it's a passive creature meaning that it will only attack when it is threatened. When it is threatened however it releases a cloud of Mold that converts Pikmin into Moldmin, as such Cleaner Pikmin are the best option when taking on these creatures.

The Moldstool when at half health will begin to run away from you while periodically spraying Mold without the need to be attacked making it quite harder in conjunction with the floor also having Fire Geysers and Olive Bulblings.

Olimar's Notes
"The Moldstool seems to share most of the same anatomy and DNA as the Puffstool I discovered on my first trip to this planet. However, this specimen seems to spread a type of Mold that can cause neural problems when inhaled. Due to the lack of any Puffstools in this trip, I theorize that the Moldstool is an evolution of the Puffstool."

Louie's Cooking Tips
"Inedible, the Mold on this beast will spoil any food it come into contact with."

In Pikmin: Spark
The Moldstool appears in Pikmin: Spark where it acts completely different despite looking the same as it did in its debut. Now living in dens these Sporovids now use their mold to infect the corpses of enemies rather than pikmin. The Moldstool is usually surrounded by several enemies to assist it as a mode of defense, and when attacked will run away before flipping over. However, instead of spreading corrupting spores the Moldstool instead releases a cloud of poisonous green gas that instantly kills any Pikmin attacking the Moldstool. It can also spread a white mold that can revive any enemy from death, although if the enemy uses an elemental hazard the Moldstool will convert the hazard into Poison if possible. Due to all the poison involved White Pikmin is the best choice when fighting the Moldstool. Upon death, it drops the Smoke Capsule, a container of pepper worth.