Facts about the Bleeding Tooth Fungus (Hydnellum peckii)

The fungus usually grows among mosses and pine needle litter at the base of coniferous trees. This type of mutualistic association that is particularly beneficial to the host is termed as ectomycorrhizal relationship.

Both Hydnellum diabolus and Hydnellum peckii look similar, but Hydnellum diabolus comes with a pungent sweetish odor.

Usually, the fruit bodies have a funnel-shaped cap with a white edge. The enzymes produced by the fungus convert the organic compounds into absorbable forms, and improve the plant’s mineral absorption capabilities. However, it has an extremely peppery, very bitter taste. Ecological factors, such as moisture, temperature, and availability of organic content to support their growth, determine the distribution of fungi.

The fruit bodies of bleeding tooth fungus are not produced consistently every year. The surface of a matured cap becomes tough and fibrous. As a result of this, the shape of the cap can be round or irregular, and the width can be 4 to 20 cm (7.9 in).

Because of the strange appearance of the young fruit bodies, this hydnoid fungus can be easily identified when young. Atromentin also carries useful antibacterial properties.


Kingdom: Fungi Division: Basidiomycota Class: Agaricomycetes Order: Thelephorales Family: Bankeraceae Genus: Hydnellum Species: Hydnellum peckii


When young, the cap is covered with hair. The tooth fungi produce spores on the tooth-like projections that emerge from the underside of the cap. The pinkish-white teeth also turn grayish-brown.

The bleeding tooth fungus is a mycorrhizal fungus. There are 3-5 teeth per square millimeter. It is found growing solitary, scattered, or even clustered together in forests dominated by jack pine, lodgepole pine, Douglas-fir, fir, and hemlock. Due to the red droplets that are present on the pinkish or whitish young fruit bodies, the fungus has earned the names ‘bleeding Hydnellum’ and ‘red-juice tooth’.

This fungus is found in North America, especially in the Pacific Northwest. On maturity, it turns grayish-brown and loses its characteristic features. It thrives in mountainous or sub-alpine ecosystems.

The fungus bioaccumulates the heavy metal caesium and plays an important role in the retention and cycling of caesium-137 in organic-rich forest soils.

The fungus comes with a cap and a stipe (stem). The bleeding tooth fungus is known as ‘strawberries and cream’, as it resembles the dessert. The fungus belongs to the genus Hydnellum, a genus of tooth fungi. One may think that a bleeding tooth fungus is a fungus that makes a tooth bleed, or some other grotesque interpretations may come to the reader’s mind after stumbling upon the name. Recently, it was discovered in Iran as well as Korea. It establishes a mutual relationship with roots of certain trees (hosts). Because of the red spots splattered across its white cap, the mushroom looks somewhat like a bleeding tooth. They contain a chemical called atromentin which exhibits effective anticoagulant properties like heparin. So, it is inedible.

Interesting Facts

Is Bleeding Tooth Fungus Edible?

Did You Know?

The colorful pigments produced by Hydnellum species are used to dye textiles. It is also seen in some parts of Europe (Italy, Germany, Scotland). They are slender, less than 5 mm (0.20 in) long.

Some Hydnellum species produce yellow drops while some produce coffee-colored drops. A stem can be 5 cm long, but only about 0.1 to 1 cm (0.0 to 0.4 in) may appear above ground. Fruit bodies, growing very close, often fuse together (the process is called ‘confluence’). The thick, short stems are often deformed. However, great variations in the shape have been noticed.. It should be noted that the absence of fruit bodies does not indicate the absence of its mycelium in the soil. So, the caps of mature fungi are smooth.

The fruit bodies can reach a height of up to 10.5 cm (4.1 in). So, counting the fruit bodies may not help determine the distribution of the fungus. It is seen growing on coniferous forest grounds. In return, it gets ‘fixed carbon’ from the host. The fungus has an exceedingly transient diploid state. The upper part of a stem is covered by threads while the lower part which is close to the ground is covered by thin hair.

A striking, thick red fluid oozes through the young fruit bodies when they are moist.

The ruby-red fluid that oozes through small pores of Hydnellum peckii, an amazing mushroom, looks like blood. During the process of aging, the fungus loses the hair. With the help of polymerase chain reaction (PCR) technology, scientists can detect the presence of fungal DNA in the soil and can assess the distribution of fungi.

The fungus comes with a mild odor (similar to hickory nuts), and is not poisonous. In 1913, the American mycologist Howard James Banker first described the fungus scientifically.

During the life cycle of H.peckii, the dikaryotic (the fungus has two nuclei from different parents) and haploid states last for almost an equal amount of time

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