 Lactarius rupestris is a species of mushroom in the Russulaceae family . Described as a new species in 2010 , it is known only from the semi @-@ arid region in the National Park of Catimbau of Brazil . The mushroom is characterized by a stout fruit body with a smooth and sticky orange cap up to 7 cm ( 2 @.@ 8 in ) in diameter . The gills on the underside of the cap are closely spaced and frequently anastomosed . The stem is 35 – 45 mm ( 1 @.@ 4 – 1 @.@ 8 in ) long by 18 – 21 mm ( 0 @.@ 71 – 0 @.@ 83 in ) thick . The mushrooms exude a sparse cream @-@ colored latex when cut or injured . 
