page_title: Pulveroboletus auriflammeus
section_title: Description
hierarchical_section_title: Pulveroboletus auriflammeus / Description
caption_attribution_description: English: The pore surface of the bolete mushroom Boletus auriflammeus Berk. &amp; M.A.Curtis. Specimen found in Brook Park, Ohio, USA.
context_page_description: Pulveroboletus auriflammeus, commonly known as the flaming gold bolete, is a species of bolete fungus in the family Boletaceae. Described as new to science in 1872, it is found in eastern North America, where it grows in a mycorrhizal association with oaks. The caps of the fruit bodies are golden orange, with a yellow pore surface on the underside, and a reticulated stem. The edibility of the mushroom is not known.
context_section_description: The cap is initially convex before becoming broadly convex to flattened in age, and attains a diameter of 3–9.5 cm (1.2–3.7 in). The cap surface is dry, and, in young individuals, has a powdery coating that will stain hands yellow if handled. Later, the cap becomes tomentose (hairy), and sometimes develops small cracks. The cap color is bright orange-yellow, sometimes mixed with olive tints. The flesh is white to cream, and does not bruise blue when injured or exposed to air by cutting. Its odor is not distinctive, and its taste either not distinctive or acidic. The pore surface is initially yellow to yellow orange, becoming olive-yellow to greenish yellow in age, sometimes developing bright crimson to crimson-orange tints. The tube attachment to the stem is adnate to subdecurrent (running slightly down the length of the stem) and often depressed near the stem at maturity. The pores are angular, radially elongated near the stem, and typically more than 1 mm wide in maturity. Tubes are up to 1.5 cm (0.6 in) deep. The stem is 5–9 cm (2.0–3.5 in) long, 5–12 mm (0.20–0.47 in) thick, and either nearly equal in width throughout or slightly enlarged in either end. The stem surface is usually reticulate at least on the upper portion of mature specimens, although this characteristic is less pronounced or absent in young indivisuals. The mycelium at the base of the stem is white. The stem has neither a partial veil nor an annulus. Boletus auriflammeus produces an olive-brown to ochre-brown spore print. It is not known if the fruit bodies are edible.
  Spores are roughly elliptical to somewhat spindle-shaped, smooth, nearly hyaline (translucent), and measure 8–12 by 3–5 μm. The cheilocystidia (cystidia on the tube edge) are abundant, thin-walled, broadly club-shaped to sphaeropedunculate (rounded and with a short stalk). The pleurocystidia (cystidia on the tube face) are abundant, think-walled, broadly ventricose (swollen in the middle) or sometimes club-shaped. The cap cuticle is made of hyphae with bright yellow encrusted crystals in water that dissolve in potassium hydroxide to produce a diffuse lemon-yellow pigment.
caption: Pores and reticulations on the upper stem
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