Cryptomeria

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For the computer science cipher, see Cryptomeria cipher

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iCryptomeria japonica

"Jomon Sugi", the largest specimen of Cryptomeria known, on Yakushima, Japan

Conservation status

Near Threatened (LR/nt)

Scientific classification

Kingdom:	Plantae
Division:	Pinophyta
Class:	Pinopsida
Order:	Pinales
Family:	Cupressaceae
Genus:	Cryptomeria
Species:	C. japonica

Binomial name

Cryptomeria japonica
(L.f.) D.Don

Cryptomeria is a genus of conifer in the cypress family Cupressaceae formerly belonging to the family Taxodiaceae; it includes only one species, Cryptomeria japonica (syn.: Cupressus japonica L.f.) . It is endemic to Japan, where it is known as Sugi (Japanese: 杉); this vernacular name is increasingly being used as the English name as well, replacing the old, botanically inaccurate name "Japanese Cedar" - the tree is not related to the cedars (Cedrus).

Cryptomeria japonica: (left) shoot with mature cones and immature male cones at top; (centre) adult foliage shoot; (right) juvenile foliage shoot

It is a very large evergreen tree, reaching up to 70 m (230 ft) tall and 4 m (12 ft) trunk diameter, with red-brown bark which peels in vertical strips. The leaves are arranged spirally, needle-like, 0.5-1 cm long; and the seed cones globular, 1-2 cm 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 in Giant Sequoia) and smaller cones (4-6 cm in Giant Sequoia), and the harder bark on the trunk (thick, soft and spongy in Giant Sequoia).

Sugi has been so long-cultivated in China that it is thought by some 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.

[edit] Symbolism and uses

Sugi avenue at the Togakushi shrine in Nagano.

Sugi is the National tree of Japan, commonly planted around temples, with many hugely impressive trees planted centuries ago. Sargent (1894; The Forest Flora of Japan) recorded the instance of a Daimyo (prince) who was too poor to donate a stone lantern at the funeral of the Shogun Tokugawa Ieyasu (1543-1616) at Nikkō Tōshō-gū, but requested instead to be allowed to plant an avenue of Sugi, 'that future visitors might be protected from the heat of the sun'. The offer was accepted; the avenue, which still exists, is over 65 km (40 miles) long, and 'has not its equal in stately grandeur'.

It is also extensively used in forestry plantations in Japan and China, and is widely cultivated as an ornamental tree in other temperate areas, including Britain, Europe and North America.

One very popular ornamental form is the cultivar 'Elegans', which is notable for retaining juvenile foliage throughout its life, instead of developing normal adult foliage when one year old. The right hand specimen in the box photo is of this cultivar. It makes a small, shrubby tree 5-10m tall.

A forestry plantation of Cryptomeria

The wood is 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.

Cryptomeria is used as a food plant by the larvae of some moths of the genus Endoclita including E. auratus, E. punctimargo and E. undulifer.