Shiitake (Lentinula edodes)

The shiitake (Lentinula edodes) is an edible mushroom native to East Asia, which is now cultivated and consumed around the globe. It is considered a medicinal mushroom in some forms of traditional medicine.

Habitat and distribution
Shiitake grow in groups on the decaying wood of deciduous trees, particularly shii and other chinquapins, chestnut, oak, maple, beech, sweetgum, poplar, hornbeam, ironwood, and mulberry. Its natural distribution includes warm and moist climates in Southeast Asia.

Cultivation history
The earliest written record of shiitake cultivation is seen in the Records of Longquan County (龍泉縣志) compiled by He Zhan (何澹) in 1209 during the Song dynasty in China. The 185-word description of shiitake cultivation from that literature was later cross-referenced many times and eventually adapted in a book by a Japanese horticulturist Satō Chūryō (佐藤中陵) in 1796, the first book on shiitake cultivation in Japan. The Japanese cultivated the mushroom by cutting shii trees with axes and placing the logs by trees that were already growing shiitake or contained shiitake spores. Before 1982, the Japan Islands' variety of these mushrooms could only be grown in traditional locations using ancient methods. A 1982 report on the budding and growth of the Japanese variety revealed opportunities for commercial cultivation in the United States.

Shiitake are now widely cultivated all over the world, and contribute about 25% of total yearly production of mushrooms. Commercially, shiitake mushrooms are typically grown in conditions similar to their natural environment on either artificial substrate or hardwood logs, such as oak.

Culinary
Nutrition
In a 100-gram (3+1⁄2-ounce) reference serving, raw shiitake mushrooms provide 141 kilojoules (34 kilocalories) of food energy and are 90% water, 7% carbohydrates, 2% protein and less than 1% fat. Raw shiitake mushrooms are rich sources (20% or more of the Daily Value, DV) of B vitamins and contain moderate levels of some dietary minerals.

Like all mushrooms, shiitakes produce vitamin D2 upon exposure of their internal ergosterol to ultraviolet B (UVB) rays from sunlight or broadband UVB fluorescent tubes.

In 2015, a study with 52 adults indicated that regular consumption of shiitake can result in improved immunity.

Uses
Fresh and dried shiitake have many uses in East Asian cuisine. In Japan, they are served in miso soup, used as the basis for a kind of vegetarian dashi, and as an ingredient in many steamed and simmered dishes. In Chinese cuisine, they are often sautéed in vegetarian dishes such as Buddha's delight.

One type of high-grade shiitake is called donko (冬菇) in Japanese and dōnggū in Chinese, literally "winter mushroom". Another high-grade of mushroom is called huāgū (花菇) in Chinese, literally "flower mushroom", which has a flower-like cracking pattern on the mushroom's upper surface. Both of these are produced at lower temperatures.

Research
Dermatitis
Rarely, consumption of raw or slightly cooked shiitake mushrooms may cause an allergic reaction called "shiitake dermatitis", including an erythematous, micro-papular, streaky pruriginous rash that occurs all over the body including face and scalp, appearing about 24 hours after consumption, possibly worsening by sun exposure and disappearing after 3 to 21 days. This effect – presumably caused by the polysaccharide, lentinan – is more common in East Asia, but may be growing in occurrence in Europe as shiitake consumption increases. Thorough cooking may eliminate the allergenicity.

Other uses
There is research investigating the use of shiitake mushrooms in production of organic fertilizer and compost from hardwood.
en.wikipedia.org