榆硬孔菌，属多孔菌科一种，是木栖寄生的中大型菇类，该菇类生长于如**等地之低中海拔林区，生长期间约是在春夏两季之间。而本菇类最大特色是加工后可作为提升免疫力之药材。

• 周文能、张东柱，《野菇图鉴》，2005年，**，**馆出版社

Rigidoporus ulmarius is a plant pathogen found mainly on broad-leaved trees. It used to be very common on elm.

The fruiting bodies are white, knobbly and relatively hard, requiring a fair amount of force to break. Older bodies may be covered with green algae, or partially covered with vegetation and leaves making them difficult to spot. They often encapsulate grass, twigs and other debris.