COMMON NAME: Hollow-stalked Larch Suillus, Hollow-stemmed Tamarack Jack.

CAP: (3-10 cm) wide, rounded to convex, becoming nearly flat, occasionally with a rounded umbo; surface dry, not sticky or slimy, covered with dark brown to yellow-brown fibers and scales with an almost suede-like texture; margin often rimmed with whitish, dry veil remnants; flesh yellow, not staining blue when cut or bruised; odor and taste not distinctive.

PORE SURFACE: pale yellow to olive-yellow, not staining blue when cut or bruised; pores angular, sometimes radiating from the stalk, 0.5-1.5 mm or more wide.

STALK: (3-9 cm) long, (1-2.5 cm) thick, nearly equal or enlarging slightly downward, typically hollow in the lower half at maturity, yellow on the upper portion, colored like the cap below, not reticulate and without glandular dots or smears, not staining blue or green when cut or bruised; veil present, often leaving a slight ring on the stalk.

SPORE PRINT: brown.

MICROSCOPIC FEATURES: spores 7-10 x 3.5-4 μm, narrowly oval to ventricose, smooth, pale brown.

FRUITING: scattered or in groups on the ground under larch in forests and bogs; September-October; fairly common.

EDIBILITY: edible.

COMMENTS: also known as Boletus cavipes.

From Mushrooms of Northeastern North America Alan E. Bessette, Arleen R. Bessette, & David W. Fischer  Copright © 1997 Syracuse University, ISBN 0-8156-0388-6