Rapid plant movement slower "growth-movements" of plants, called tropisms. Tropisms encompass movements that lead to physical, permanent alterations of the plant while rapid plant movements are usually reversible or occur at over a shorter span of time. A variety of mechanisms are utilized by plants in order to achieve these fast movements. Extremely fast movements such as the explosive spore dispersal techniques of "Sphagnum" mosses may involve increasing internal pressure via dehydration, causing a sudden propulsion of spores up or through the rapid opening of the "flower" opening triggered by insect pollination. Fast movement can also be expressed in predatory plants, where the
Sphagnum palustre marshy meadows, but rarely in moors. The species often forms large carpets, sometimes bulge-shaped. It is often accompanied by "Sphagnum fimbriatum", "Sphagnum subnitens", and "Sphagnum squarrosum". "Sphagnum palustre" is invading the native habitat at Ka'ala, O'ahu, Hawai'i. It became established after a sample was brought to the island by a botanist in 1960. Although the environment does not allow the plant to reproduce sexually via spores, it is capable of spreading through vegetative reproduction. It currently occupies an area estimated at 17.3 acres. Coordinated eradication efforts have proved difficult. Sphagnum palustre is found all over the British Isles. It is