Exsudoporus frostii

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Exsudoporus frostii 100632

Exsudoporus frostii (binomial name: Exsudoporus frostii, formerly known as Boletus frostii), commonly known as the Frost's Bolete or the Apple Bolete, is a mushroom species belonging to the Boletaceae family. This fungus is notable for its striking appearance, with a bright red cap, yellow to orange pores, and a red to orange stipe that features a distinctive net-like pattern. Exsudoporus frostii is found in North America, particularly in eastern regions, where it grows in symbiosis with hardwood trees, especially oaks.

Description

Exsudoporus frostii features a cap that can range from 5 to 15 cm in diameter, initially hemispherical before flattening out with age. The cap's surface is smooth and often sticky or slimy when wet, displaying a vivid red or scarlet color. The pores on the underside of the cap are small and round, changing color from yellow in young specimens to orange or red as they age. The stipe ranges from 4 to 10 cm in height and 1 to 2.5 cm in thickness, colored similarly to the cap and adorned with a reticulate (net-like) pattern that is more pronounced towards the top.

The spore print of Exsudoporus frostii is olive-brown. Microscopically, its spores are fusiform (spindle-shaped) and smooth.

Habitat and Distribution

Exsudoporus frostii is primarily found in eastern North America, from Canada down to Mexico. It forms mycorrhizal relationships with hardwood trees, with a particular affinity for oaks (Quercus spp.). This species prefers well-drained soils and is typically found in deciduous forests.

Edibility

The edibility of Exsudoporus frostii is a subject of debate, with some sources suggesting that it is edible, while others advise against consumption due to its potential to cause gastrointestinal upset. If consumed, it is recommended to be cooked thoroughly. However, due to its striking appearance and the potential for confusion with toxic species, caution is advised.

Conservation

While Exsudoporus frostii is not currently listed as endangered, its habitat is threatened by deforestation and urban development. Conservation efforts are important to preserve the natural habitats where this species thrives.

See Also

• Boletaceae
• Mycorrhiza
• Fungi of North America