Libocedrus yateensis
Libocedrus yateensis is a conifer of the genus shed cedar ( Libocedrus ) forming evergreen shrubs or small trees. The distribution area is located in the North and South Province of New Caledonia. Where it grows in river valleys at altitudes of 150 to 600 meters. It is critically endangered and has no economic significance.
- 6.1 Literature
- 6.2 Notes and references
Description
Habit
Libocedrus yateensis forms shrubs or small, from 2 to 10 and sometimes 12 meters high trees with trunk diameters of 10 to 30 centimeters. The bark is rough and scaly, reddish brown and peels off in thin, longitudinal, irregular strips and plates. The branches are ascending or spread and form in young trees a conical crown, which is bushy later. The leafy branches resemble fern fronds and forming dense tufts. The outermost branches grow almost opposite to alternate constantly, are completely covered by leaves, change, unequal in length and shorter towards the end of the main branch. They have a cross section of approximately 4 millimeters.
The leaves grow decussate and are particularly bent back at the outer branches toward the tip or stand-off. At the extreme branches are overlapping and clearly two diverse. The area leaves are 1.5 to 2 mm long, rhombic, pressed, keeled, apiculate and partially covered at the base of the leaf edges towards the tip. The edges of leaves are flattened on both sides, spreading, falcate - lanceolate, 2-5 mm long and 1-2 mm wide, entire to trockenhäutig, with pointed or sharply pointed tip. The leaves form on both sides of stomata in leaves surface near the base, at the edges of leaves they are unclear on the top, on the bottom in a reaching to the blade tip clearly visible band formed. The leaves are glossy olive green, the gap opening strip bluish white.
Cones and seeds
The pollen cones are individually at branch ends. They are cylindrical, 5 to 8 times to 10 millimeters long with a diameter of 2 to 2.5 millimeters. The 16 to 24 Mikrosporophylle grow decussate. You are shield-shaped, apiculate, keeled, entire and have four small, yellow, abaxial pollen sacs. The seed cones are at the ends of branches, which form almost the same multiform leaves. They develop within a period of growth and are thereby thin woody. The both of the upper shed are 8-9 mm long and 3-4 mm wide, the lower pair being smaller, with lengths from 4 to 6 mm and width of about 2 millimeters. Both pairs are slightly wrinkled and form a 9-10 mm long spigot. The pin one or two ovate -oblong, slightly flattened, 5-6 mm long and about 2.5 mm wide, light brown seeds with two opposite, thin-skinned wings are formed. The smaller wing forms a less than 1 millimeter wide strip, the larger is yellowish brown, oval-oblong, 6-7 mm long and 2.5 to 3 millimeters wide.
Distribution and habitat requirements
The natural range of Libocedrus yateensis located in New Caledonia in the Southern Province at Rivière Bleue Yaté River and on Ouinné River and in the northern province at Povila. It grows at altitudes of 150 to 600 meters on sediments along rivers less than individual trees or in small groups. As one more representative of the cypress family are found Neocallitropsis pancheri in this habitat in addition to various shrubs and ferns.
Endangering
In the IUCN Red List Libocedrus yateensis is listed as endangered ( " Endangered "). The range of the species is limited to split into three isolated populations on 24 square kilometers. Two populations exist in river valleys in the Southern Province, one of them protected in the Parq Rivière Bleue de Yaté. A population is located in the northern province near Povila. However, the conditions worsen due to forest fires and lack of regeneration.
Systematics and history of research
Libocedrus yateensis is a species of the genus the scales cedars ( Libocedrus ) in the family of the cypress family ( Cupressaceae ). It was first described in 1949 by André Guillaumin in the Bulletin du Muséum National d' Histoire Naturelle. The genus name is derived from the Greek Libocedrus Libo for " tear" or "drop " down, thus pointing to emerging drop of resin, and of cedrus the generic name of the cedars. The specific epithet refers to the yateensis place name Yaté, the locality which led to the first description.
Alexander Borisovich Doweld ordered 2001, the three scales cedar species from New Caledonia, Libocedrus yateensis, Libocedrus austrocaledonica and Libocedrus chevalieri, a separate class Stegocedrus to. This classification is not recognized, Stegocedrus yateensis is just a synonym of Art
Use
The species is not used commercially. Some young plants are cultivated in a few botanical gardens in glasshouses for research purposes.