Língzhī (traditional Chinese: 靈芝; simplified Chinese: 灵芝; Japanese: reishi; Korean: yeongji, hangul: 영지) is the name for one form of the mushroom Ganoderma lucidum, and its close relative Ganoderma tsugae, which grows in the northern Eastern Hemlock forests. These two species of bracket fungus have a worldwide distribution in both tropical and temperate geographical regions, including North and South America, Africa, Europe, and Asia, growing as a parasite or saprotroph on a wide variety of trees. Ganoderma lucidum enjoys special veneration in Asia, where it has been used in traditional Chinese medicine as a herbal medicine for more than 4,000 years, making it one of the oldest mushrooms known to have been used in medicine. Similar species of Ganoderma have been found growing in the Amazon, according to Christopher Hobbs.

The word lingzhi, in Chinese, means "herb of spiritual potency" and has also been described as "mushroom of immortality".[1] Because of its presumed health benefits and apparent absence of side-effects, it has attained a reputation in the East as the ultimate herbal substance. Lingzhi has now been added to the American Herbal Pharmacopoeia and Therapeutic Compendium.

Taxonomy and naming

The name Ganoderma is derived from the Greek ganos/γανος "brightness, sheen", hence "shining" and derma/δερμα "skin",[3] while the specific epithet lucidum in Latin for "shining" and tsugae refers to being of the Hemlock (Tsuga). Another Japanese name is mannentake, meaning "10 000 year mushroom".

There are multiple species of lingzhi, scientifically known to be within the Ganoderma lucidum species complex and mycologists are still researching the differences between species within this complex of species.

Description

Lingzhi is a polypore mushroom that is soft (when fresh), corky, and flat, with a conspicuous red-varnished, kidney-shaped cap and, depending on specimen age, white to dull brown pores underneath. It lacks gills on its underside and releases its spores through fine pores, leading to its morphological classification as a polypore.

Varieties

Ganoderma lucidum generally occurs in two growth forms, one, found in North America, is sessile and rather large with only a small or no stalk, while the other is smaller and has a long, narrow stalk, and is found mainly in the tropics. However, many growth forms exist that are intermediate to the two types, or even exhibit very unusual morphologies, raising the possibility that they are separate species. Environmental conditions also play a substantial role in the different morphological characteristics lingzhi can exhibit. For example, elevated carbon dioxide levels result in stem elongation in lingzhi. Other forms show "antlers', without a cap and these may be affected by carbon dioxide levels as well.