Тасмандияның төмен өсетін шыршығы: Microcachrys tetragona

Genus of conifers

Microcachrys tetragona, known as creeping pine or creeping strawberry pine, is a species of dioecious conifer belonging to the podocarp family (Podocarpaceae). It is the sole species of the genus Microcachrys. The plant is endemic to western Tasmania, where it is a low shrub growing to 1 m tall at high altitudes. Its leaves are scale like, arranged (unusually for the Podocarpaceae) in opposite decussate pairs, superficially resembling those of the unrelated Diselma archeri (Cupressaceae). It shares the common name Creeping pine with several other plants. Females produce tiny, red, edible berries in summer.

Microcachrys has been called one of the most spectacular cases of paleoendemism. It is a known relictual plant, being widespread in the past but now having a very restricted distribution. The only extant species today, Microcachrys tetragona, produces a very distinctive pollen grain compared with other members of its family, Podocarpaceae, and records of fossil pollen from the genus have been recorded from all over the Southern Hemisphere throughout the Cenozoic, being found in Antarctica, Australia, the now sunken islands of the Ninetyeast Ridge of the Indian Ocean, New Zealand, southern Africa and South America. Ocean drillings in the Kerguelen Plateau near Heard Island have revealed conifer remains with twigs very similar in appearance to those of Microcachrys. The genus Microcachrys clearly had a very broad, Gondwanic distribution. But now, the sole surviving species, Microcachrys tetragona, is a shrub restricted to Tasmanian mountain thickets and boulder fields. The fossil record of Microcachrys is one of many compelling lines of evidence which points to the highly dynamic and changing Southern Hemisphere vegetation through the Cenozoic since the break up of Gondwana.