变绿红菇（学名：Russula virescens）是一种红菇属的担子菌菇类，又称为野生绿菇、绿菌、青盖子、青菌（中国东北）、青面梨菇（福建）、青蛙菌、绿豆菌（广西）、青脸菌（四川）、青头菌（昆明）和青汤菌（贵州）。它的主要的外观鉴别特征包括：淡绿色菌盖，表面附有深绿色突起；致密的白色菌褶；以及白色柱状、实心菌柄。变绿红菇分布广遍英国、欧洲和亚洲，或单株、或群散，生长在落叶及混合林的土壤上，多与栎树、欧洲山毛榉等硬木树种共生形成菌根。它可能也出现在北美洲，但由于易与黄斑绿菇（学名：Russula crustosa）等类似菇种混淆，迄今未有明确定论。此外，研究显示，变绿红菇的核糖核酸酶相较于其他食用菇类，具有特殊的生物化学属性。

Russula virescens is a basidiomycete mushroom of the genus Russula, and is commonly known as the green-cracking russula, the quilted green russula, or the green brittlegill. It can be recognized by its distinctive pale green cap that measures up to 15 cm (6 in) in diameter, the surface of which is covered with darker green angular patches. It has crowded white gills, and a firm, white stipe that is up to 8 cm (3 in) tall and 4 cm (1.6 in) thick. Considered to be one of the best edible mushrooms of the genus Russula, it is especially popular in Spain and China. With a taste that is described variously as mild, nutty, fruity, or sweet, it is cooked by grilling, frying, sautéeing, or eaten raw. Mushrooms are rich in carbohydrates and proteins, with a low fat content.