赤芝（学名：Ganoderma lucidum），是灵芝属下的一个种。

在《神农本草经》中将灵芝依色泽的不同划分成赤芝、黄芝、白芝、青芝、黑芝、紫芝六种。而现代常见的只有赤芝和紫芝两种，其它以野生为主。

• 赤芝（Ganoderma lucidum (Leyss. ex. Fr.) Karst.）
• 紫芝（Ganoderma japonicum (Fr.) Lloyd）

The lingzhi mushroom or reishi mushroom (traditional Chinese: 灵芝;pinyin: língzhī;Japanese: reishi;Vietnamese:linh chi;literally: "soul/spirit mushroom") is a species complex that encompasses several fungal species of the genus Ganoderma, most commonly the closely related species Ganoderma lucidum, Ganoderma tsugae, and Ganoderma sichuanense. G. sichuanense enjoys special veneration in East Asia, where it has been used as a medicinal mushroom in traditional Chinese medicine for more than 2,000 years, making it one of the oldest mushrooms known to have been used medicinally. Lingzhi is listed in the American Herbal Pharmacopoeia and Therapeutic Compendium.