Қауіпті жағдайдағы Кояма шыршысы

Species of conifer

Picea koyamae (Koyama's spruce; Japanese: ヤツガタケトウヒ or やつがたけとうひ yatsugatake touhi) is a rare spruce, endemic to the Akaishi Mountains and Yatsugatake Mountains in central Honshu, Japan. It is an evergreen tree growing to tall, with a trunk diameter of up to a metre. It grows in small isolated stands in a limited area and the total area of occupation is less than Trees that are lost to typhoons are normally replaced with other faster growing species and the International Union for Conservation of Nature has rated the tree as "critically endangered". Some trees are in cultivation as an ornamental tree.

It is a monoecious evergreen tree growing to 25 m tall, with a trunk diameter of up to 1 m. The shoots are orange brown, with scattered pubescence. The leaves are needle like, 8–16 mm long, rhombic in cross section, dark bluish green with conspicuous stomatal lines. The cones are cylindric conic, 4–9 cm long and 2 cm broad, maturing pale brown 5–7 months after pollination, and have stiff, smoothly rounded scales 6–18 mm long and 6–12 mm wide. Pollination takes place in late spring.

Koyama's spruce is native to the Akaishi Mountains and Yatsugatake Mountains, or Nagano and Yamanashi Prefectures in central Honshū, Japan, where it grows at 1500–2000 m altitude. It is found growing in groups of 10–20, with a total population of only about 250 mature trees. The main cause of decline is the loss of natural regeneration after typhoons, with windblown trees being replaced by the planting of other faster growing commercially valuable species. Other threats include wildfires, landslides and changes in temperature and precipitation associated with climate change. There is little genetic exchange between different fragmentary locations where it grows, and the total area of occupation by this tree is less than
It is occasionally planted as an ornamental tree. The wood is similar to that of other spruces, but the species is too rare to be of economic value.