A newly isolated mushroom strain Lentinus tuberregium, was cultivated, and evaluated for nutritional profile (whole mushrooms) on dry weight basis for their proximate, mineral compositions. The cultivated mushroom accumulated higher concentrations of carbohydrates (55.8%) and protein (25%), moisture (9.4%) total ash (4.7%) crude fibre (3.6%) fat (1.6%) potassium (7.53mg/gm) calcium (2.66mg/gm) magnesium (2.45mg/gm) sodium (1.2mg/gm) iron(0.53mg/gm) copper(0.11mg/gm) zinc(0.41mg/gm) manganese(0.08mg/gm) energy(338kcal) concentrations. Of the nutritive elements analysed, potassium was the most dominant with concentration as high. Followed by calcium, magnesium, sodium respectively.