Poisonous King Bolete Mushroom

As a mushroom grower and enthusiast, I have always been fascinated by the world of fungi. One particular species that captivates my attention is the poisonous king bolete mushroom. Also known as Rubroboletus satanas, this mushroom is a stunning but hazardous fungus that demands respect and caution.

Identification and Characteristics

The poisonous king bolete mushroom typically has a reddish to brown cap with a velvety texture. Its stout stem is often swollen at the base and can be a vibrant reddish-orange color. When cut or bruised, the flesh of this mushroom turns blue. These distinctive features make it easily recognizable, but unfortunately, it is not one that should be foraged for consumption.


The poisonous king bolete contains toxic compounds that can cause severe gastrointestinal distress if ingested. Its toxins are heat-stable, so even cooking the mushroom thoroughly does not neutralize the harmful effects. Consuming this mushroom can lead to symptoms such as vomiting, diarrhea, and abdominal pain. In severe cases, it can cause liver and kidney damage, and it is important to seek medical attention immediately if ingestion occurs.

Ecological Role

Despite its toxicity, the poisonous king bolete mushroom plays a crucial role in the ecosystem. It forms mycorrhizal relationships with trees, aiding in nutrient exchange and providing support to the forest ecosystem. While it may be dangerous to humans, it is a valuable organism in the natural world.

Cultivation Warnings

For those interested in mushroom cultivation, it is essential to be aware of the similarities between the poisonous king bolete and edible boletes. Misidentification can have dire consequences, so I always emphasize the importance of thorough research and seeking guidance from experienced foragers or mycologists.


While the poisonous king bolete mushroom is undeniably intriguing, it is imperative to approach it with caution and respect. Its beauty in the wild serves as a reminder of nature’s complexity and the importance of understanding and appreciating the diverse fungi that populate our world.