Leccinum albostipitatum is a species of bolete fungus in the family Boletaceae.[1] This large, orange-capped mushroom forms beneficial relationships with poplar trees across Europe. First described scientifically in 2005, it was previously confused with similar orange species but can be distinguished by its white stipe with fine scales that darken with age and its flesh that changes colour when cut. The mushroom grows in poplar stands and mixed forests throughout Scandinavia and mountainous areas of central Europe.
The cap reaches 80–250mm in diameter and is hemispherical when young, maturing to convex or plano‑convex. Its surface is finely tomentose and fibrillose, displaying a vivid orange that may fade toward the margin in older fruit‑bodies and often cracks slightly with age. The stipe measures 50–270mm in length and 15–50mm in thickness, initially whitish and densely clothed in fine white squamules that darken to light brown in mature specimens; handling typically induces a clear blue bruise. The flesh is white in the stipe base but turns vinaceous to greyish‑black when cut in the cap. Tubes are 9–30mm deep, adnate to slightly decurrent, with pores about 0.5mm wide that bruise brown. Microscopically, spores measure (9.5–)11.0–17.0 by 4.0–5.5μm, spindle-shaped (fusiform) with a conical apex and shallow suprahilar depression. Basidia are 25–35 by 7.5–11.0μm and four‑spored. Hymenial cystidia measure 20–45 by 7–10μm (lageniform). The cap cutical (pileipellis) is a cutis of narrow cylindrical elements (35–80 by 4.0–15.5μm) that appear yellowish‑brown in water. Caulocystidia are 15–65 by 10.0–16.0μm, clavate to fusiform. Clamp connections are absent.[2]
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