Resin discs

Resin discs
	Rimu resin ( Dacrydium cupressinum )
Systematics
Department :	Vascular plants (tracheophyta)
Subdivision :	Seed plants (Spermatophytina)
Class :	Coniferopsida
Order :	Conifers (Coniferales)
Family :	Stonecaceae (Podocarpaceae)
Genre :	Resin discs
Scientific name
	Dacrydium
	Sol. ex Lamb.

The resin slices ( Dacrydium ) are a genus of plants belonging to the stone slice family (Podocarpaceae). The botanical genus name is derived from the Greek dakra for "tear" and supposedly refers to wood.

distribution

The distribution of the genus extends from the south from New Zealand to New Caledonia , the islands of Fiji and the Solomon Islands to New Guinea , Indonesia and the Philippines , further to Thailand and to southern China as the northernmost area.

description

Dacrydium species are trees or shrubs . The leaves of young plants are shaped differently than those on older plants. The leaves of young plants are broad, those of older plants are needle-shaped or scale-shaped.

They are dioecious separate sexes ( diocesan ). The sessile male cones are single, terminal or axillary on the branches. In the case of the female cones standing at the end of the branches, only one cone scale is normally fertile , so only one seed is formed when fertilization has taken place . The seeds are surrounded by an aril and ripen within a year. In some species, the aril is fleshy and brightly colored when ripe.

use

The yellow to reddish wood is sometimes beautifully grained. It is used for building houses and furniture, among other things.

Systematics

Dacrydium balansae

Rimu resin ( Dacrydium cupressinum ) in New Zealand

The old genus Dacrydium in 1982 (see references) divided into falcatifolium , lepidothamnus , Lagarostrobos , halocarpus and Dacrydium .

Today there are 16 to 20 species of Dacrydium :

Dacrydium araucarioides Brongn. & Griseb. : It occurs in southeastern New Caledonia.
Dacrydium balansae Brongn. & Griseb. : It occurs in New Caledonia.
Dacrydium beccarii Parl . : It occurs from Malesia to the Solomon Islands.
Dacrydium comosum Corner : It occurs on the Malay Peninsula.
Dacrydium cornwallianum de foliage. : It occurs in New Guinea.
Rimu resin disk ( Dacrydium cupressinum Sol. Ex G.Forst. ), Origin: New Zealand.
Broad resin disc ( Dacrydium elatum (Roxb.) Wall. Ex Hook. ), Native to: Malaysia, Sumatra, Borneo, Laos, Thailand, Vietnam, Cambodia, Guangxi and the Philippines.
Dacrydium ericoides de foliage. : It occurs in Sarawak .
Dacrydium gibbsiae Stapf : It occurs in Borneo.
Dacrydium gracile de foliage. : It occurs in Borneo.
Dacrydium guillauminii J.Buchholz : It occurs in New Caledonia.
Dacrydium leptophyllum (Wasscher) de Laub. : It occurs in western New Guinea.
Dacrydium lycopodioides Brongn. & Griseb. : It occurs in southeastern New Caledonia.
Dacrydium magnum de foliage. : It occurs from New Guinea to the Solomon Islands and the Moluccas.
Dacrydium medium de foliage. : It occurs from the Malay Peninsula to northern Sumatra.
Dacrydium nausoriense de foliage. : It occurs in western Viti Levu .
Dacrydium nidulum de Laub. : It occurs from Sumba to Fiji .
Dacrydium novoguineense Gibbs : It occurs in New Guinea.
Dacrydium pectinatum de Laub. : It occurs from Hainan to Sumatra.
Dacrydium spathoides de foliage. : It occurs in west-central New Guinea.
Dacrydium xanthandrum Pilg. : It occurs from Malesia to the Solomon Islands.

The following hybrids are known:

Dacrydium x suprinii Nimsch ( Dacrydium araucarioides x Dacrydium guillauminii ); it was found in New Caledonia.

swell

Christopher J. Earle: Dacrydium. In: The Gymnosperm Database. October 14, 2011, accessed on October 21, 2011 (English, section description and systematics).
Liguo Fu, Yong Li & Robert R. Mill: Podocarpaceae : Dacrydium - online with the same text as the printed work . In: Wu Zheng-yi, Peter H. Raven (Ed.): Flora of China . Volume 4: Cycadaceae through Fagaceae . Science Press / Missouri Botanical Garden Press, Beijing / St. Louis 1999, ISBN 0-915279-70-3 , pp. 78 (English).
The International Plant Name Index. Retrieved January 3, 2013.

literature

David J. de Laubenfels : A revision of the Malesian and Pacific rainforest conifers, I. Podocarpaceae, in part . In: Journal of the Arnold Arboretum . tape 50 , no. 2 , 1969, p. 274-314 ( online ).
CJ Quinn: Taxonomy of Dacrydium Sol. ex Lamb. emend. de foliage. (Podocarpaceae) . In: Australian Journal of Botany . tape 30 , 1982, pp. 311-320 .
Walter Erhardt among others: The big pikeperch. Encyclopedia of Plant Names . Volume 2. Verlag Eugen Ulmer, Stuttgart 2008. ISBN 978-3-8001-5406-7 .

Individual evidence

↑ Christopher J. Earle: Dacrydium. In: The Gymnosperm Database. October 14, 2011, accessed October 21, 2011 .
↑ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m ⁿ ^o ^p ^q ^r ^s ^t ^u Rafaël Govaerts (Ed.): Dacrydium. In: World Checklist of Selected Plant Families (WCSP) - The Board of Trustees of the Royal Botanic Gardens, Kew . Retrieved April 26, 2019.
↑ Patrick Knopf, Hubertus Nimsch & Thomas Stützel: Dacrydium x suprinii, sp. nova - a natural hybrid of Dacrydium araucarioides × D. guillauminii . Feddes Repertorium 118, pp. 51-59, 2007.

Web links

Commons : Harzeiben ( Dacrydium ) - Collection of images, videos and audio files

Data sheet for resin disks ( Dacrydium Lamb.) From the Botanical Garden Tübingen.

[1] Christopher J. Earle: Dacrydium. In: The Gymnosperm Database. October 14, 2011, accessed October 21, 2011 .

[WCSP-2] ↑ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m ⁿ ^o ^p ^q ^r ^s ^t ^u Rafaël Govaerts (Ed.): Dacrydium. In: World Checklist of Selected Plant Families (WCSP) - The Board of Trustees of the Royal Botanic Gardens, Kew . Retrieved April 26, 2019.

[3] Patrick Knopf, Hubertus Nimsch & Thomas Stützel: Dacrydium x suprinii, sp. nova - a natural hybrid of Dacrydium araucarioides × D. guillauminii . Feddes Repertorium 118, pp. 51-59, 2007.