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Cryptomeria
Plate from "Flora Japonica" by Philipp Franz von Siebold and Joseph Gerhard Zuccarini
Conservation status
Near Threatened  (IUCN 3.1)[1]
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Gymnospermae
Division:	Pinophyta
Class:	Pinopsida
Order:	Cupressales
Family:	Cupressaceae
Subfamily:	Taxodioideae
Genus:	Cryptomeria D.Don
Species:	C. japonica
Binomial name
Cryptomeria japonica (L.f.) D.Don
Synonyms
Synonyms list Cryptomeria araucarioides Henkel & W.Hochst. Cryptomeria compacta Beissn. Cryptomeria elegans Jacob-Makoy Cryptomeria fortunei Hooibr. ex Billain Cryptomeria generalis E.H.L.Krause Cryptomeria kawaii Hayata Cryptomeria lobbiana Billain Cryptomeria lobbii (Carrière) Lavallée Cryptomeria mairei (H.Lév.) Nakai Cryptomeria mucronata Beissn. Cryptomeria nana Lindl. & Gordon Cryptomeria nigricans Carrière Cryptomeria pungens Beissn. Cryptomeria variegata Beissn. Cryptomeria viridis Beissn. Cupressus japonica Thunb. ex L.f. Cupressus mairei H.Lév. Schubertia japonica (Thunb. ex L.f.) Jacques Schubertia japonicum (Thunb. ex L. f.) Brongn. Taxodium japonicum (Thunb. ex L.f.) Brongn.

Cryptomeria (literally "hidden parts") is a monotypic genus of conifer in the cypress family Cupressaceae. It includes only one species, Cryptomeria japonica (syn. Cupressus japonica L.f.). It is considered to be endemic to Japan, where it is known as Sugi (杉).^[2] The tree is also called Japanese cedar^[3] or Japanese redwood^[4][5] in English. It has been extensively introduced, and cultivated for wood production on the Azores and elsewhere.

Cryptomeria is a very large evergreen tree, reaching up to 60 m (200 ft) tall and 4 m (13 ft) trunk diameter, with red-brown bark which peels in vertical strips. The leaves are arranged spirally, needle-like, 0.5–1 cm (1⁄4–3⁄8 in) long; and the seed cones globular, 1–2 cm (1⁄2–3⁄4 in) diameter with about 20–40 scales. It is superficially similar to the related giant sequoia (Sequoiadendron giganteum), from which it can be differentiated by the longer leaves (under 0.5 cm or 1⁄4 in in the giant sequoia) and smaller cones (4–6 cm or 1+1⁄2–2+1⁄4 in in the giant sequoia), and the harder bark on the trunk (thick, soft and spongy in giant sequoia).^[6] Prior to 1916, the sylvics expert E.H.Wilson measured a sugi at the village called "Sugi", Tosa Prefecture, Shikoku Island, Japan, which measured 50 m (160 ft) in height, and 25 m (82 ft) in girth at breast height.^[7]

Sugi has been cultivated in China for so long that it is frequently thought to be native there. Forms selected for ornament and timber production long ago in China have been described as a distinct variety Cryptomeria japonica var. sinensis (or even a distinct species, Cryptomeria fortunei), but they do not differ from the full range of variation found in the wild in Japan, and there is no definite evidence the species ever occurred wild in China. Genetic analysis of the most famous Chinese population, on Tianmu Mountain, containing trees estimated to be nearly 1000 years old, supports the hypothesis that the population originates from an introduction.^[8]

Outside of its native range, Cryptomeria was also introduced to the Azores in the mid 19th century for wood production. It is currently the most cultivated species in the archipelago, occupying over 12,698 hectares, 60% of the production forest and about 1/5 of the region's total land area.^[9][10]

Cryptomeria grows in forests on deep, well-drained soils subject to warm, moist conditions, and it is fast-growing under these conditions. It is intolerant of poor soils and cold, drier climates.^[11]

It is used as a food plant by the larvae of some moths of the genus Endoclita including E. auratus, E. punctimargo and E. undulifer. Sugi (and hinoki) pollen is a major cause of hay fever in Japan.^{[citation needed]}

The earliest fossil record of Cryptomeria are descriptions based on vegetative organs of †Cryptomeria kamtschatica of the Late Eocene from Kamchatka, Russia and †Cryptomeria protojaponica and †Cryptomeria sichotensis from the Oligocene of Primorye, Russia. Several fossil leafy shoots of †Cryptomeria yunnanensis have been described from Rupelian stage strata of the Lühe Basin in Yunnan, China.^[12]

From the Neogene, Cryptomeria is well represented as seed cones, leafy shoots and wood in the fossil records of Europe and Japan. †Cryptomeria rhenana was described from the early Late Miocene to the Late Miocene of Rhein in Morsbach, Germany, from the Early and Middle Pliocene of Northern Italy, to the Middle Pliocene of Dunarobba, Italy and to the Early Pleistocene of Umbria, Italy. †Cryptomeria anglica was described from the Late Miocene of La Cerdana, Spain, to the Late Middle Miocene of Brjánslækur, Iceland and from the Late Miocene to the early Pliocene Brassington Formation of Derbyshire, England. †Cryptomeria miyataensis was described from the Late Miocene of Akita, Japan. Cryptomeria japonica was described from the Late Miocene of Georgia and from the Pliocene of Duab, Abkhazia. It has also been described from the Pliocene of Honshu, Japan, Late Pliocene of Osaka, Japan and from the Pleistocene of Kyushu, Japan.^[13]

Cryptomeria japonica timber is extremely fragrant, weather and insect resistant, soft, and with a low density. The timber is used for the making of staves, tubs, casks, furniture and other indoor applications. Easy to saw and season, it is favoured for light construction, boxes, veneers and plywood. Wood that has been buried turns dark green and is much valued. Resin from the tree contains cryptopimaric and phenolic acid.^[14]

The wood is pleasantly scented, reddish-pink in colour, lightweight but strong, waterproof and resistant to decay. It is favoured in Japan for all types of construction work as well as interior panelling, etc. In Darjeeling district and Sikkim in India, where it is one of the most widely growing trees, C. japonica is called Dhuppi and is favoured for its light wood, extensively used in house building.^{[citation needed]}

In Japan, the coppicing method of daisugi (台杉) is sometimes used to harvest logs.^[15]

In dry air conditions, the initial density of Japanese cedar timber has been determined to be about 300–420 kg/m³.^[16] It displays a Young's modulus of 8017 MPa, 753 MPa and 275 MPa in the longitudinal, radial and tangential direction in relation to the wood fibers.^[16]

Cryptomeria japonica is extensively used in forestry plantations in Japan, China and the Azores islands, and is widely cultivated as an ornamental tree in other temperate areas, including Britain, Europe, North America and eastern Himalaya regions of Nepal and India.^{[citation needed]}

The cultivar 'Elegans' is notable for retaining juvenile foliage throughout its life, instead of developing normal adult foliage when one year old (see the picture with different shoots). It makes a small, shrubby tree 5–10 m (16–33 ft) tall. There are numerous dwarf cultivars that are widely used in rock gardens and for bonsai, including 'Tansu', 'Koshyi', 'Little Diamond', 'Yokohama' and 'Kilmacurragh.'^{[citation needed]}

The following cultivars have gained the Royal Horticultural Society's Award of Garden Merit (confirmed 2017):^[17]

• C. japonica 'Bandai-sugi'^[18]
• C. japonica 'Elegans Compacta'^[19]
• C. japonica 'Elegans Viridis'^[20]
• C. japonica 'Globosa Nana'^[21]
• C. japonica 'Golden Promise'^[22]
• C. japonica 'Sekkan-sugi'^[23]
• Cryptomeria japonica 'Spiralis' ^[24]
• C. japonica 'Vilmoriniana'^[25]

Sugi is commonly planted around temples and shrines, with many hugely impressive trees planted centuries ago.^[26] Sargent (1894; The Forest Flora of Japan) recorded the instance of a daimyō (feudal lord) who was too poor to donate a stone lantern at the funeral of the shōgun Tokugawa Ieyasu (1543–1616) at Nikkō Tōshō-gū, but requested instead to be allowed to plant an avenue of sugi, so that "future visitors might be protected from the heat of the sun". The offer was accepted; the Cedar Avenue of Nikkō, which still exists, is over 65 km (40 mi) long, and "has not its equal in stately grandeur".^[27]

Jōmon Sugi (縄文杉) is a large cryptomeria tree located on Yakushima, a UNESCO World Heritage Site, in Japan. It is the oldest and largest among the old-growth cryptomeria trees on the island, and is estimated to be between 2,170^[28] and 7,200 years old.^[29][30]

Cryptomeria are often described and referred to in Japanese literature. For instance, cryptomeria forests and their workers, located on the mountains north of Kyoto, are featured in Yasunari Kawabata's famous book The Old Capital.^{[citation needed]}

• 
  A forestry plantation
• 
  Great sugi of Kayano
• 
  Sugi avenue at the Togakushi shrine in Nagano
• 
  Cross section
• 
  Wilson's Stump was a sugi tree on Yaku Island estimated to be over 2,000 years old when cut
• 
  Grown as a bonsai
• 
  Seed cone

• Gymnosperm Database: Cryptomeria

• Cryptomeria anglica, Boulter and Chaloner, 1968; a fossil species from Pliocene deposits in Derbyshire, England.

Wikimedia Commons has media related to Cryptomeria japonica.

• Cryptomeria japonica, Morton Arboretum acc. 560–82*11 & 12
• USDA Forest Service Fact Sheet ST-219 Japanese Cedar (pdf)
• Conifers Around the World: Cryptomeria japonica - Sugi.