Boletus subluridellus Smith & Thiers Cap 5-10cm across, broadly convex; from deep blood red to vermilion or orange-red, dull brown when old, instantly deep blue when touched; velvety- tomentose. Tubes yellow bruising blue. Pores minute; deep carmine red, instantly bruising blue. Stem 40-90 x 15-25mm, equal; yellow ground color overlaid with red pruina, especially at base; extreme base with pale yellow tomentum; surface bruising deep blue. Flesh lemon yellow, blue when cut. Odor pleasant. Taste pleasant. Spores subfusoid, smooth, 10.8-13(15) x (3.8)4-5.5µ. Deposit olive. Habitat under oak. Frequent. Found in northeastern North America. Season July-September. Comment It lacks the red hairs at stem base found in the similar Boletus subvelutipes Pk. Edibility suspect, best avoided.