How do santol seeds disperse by fire?

On our hiking and study trips you can climb active volcanoes under an expert guide, be inspired by the geology, nature and culture of the country and get to know nice people.
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Explanation of volcanological terms and technical terms:

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Our tour guide Marta poses in Lipari pumice stone ...
Pumice from the Greek island Santorini
Pumice stone (pumice) is a very light, very porous and mostly light-colored volcanic rock that is created when very gaseous and viscous lava foams and solidifies as foam.
Pumice is formed in explosive eruptions of mostly very silicon-rich ("acid") magma. The proportion of gas bubbles is usually so high that the pumice stone is lighter than water and floats.
As a basic material for high-quality cements and insulating lightweight building blocks, pumice is a sought-after industrial raw material.
Pumice is a textural term for a volcanic rock, which is a compacted foamy lava of very microvesicular glass pyroclastic with very thin, translucent bubble walls of extrusive igneous rock. It is usually, but not exclusively, of silicate or volcanic to intermediate in composition (e.g. rhyolite, dazitic andesite, pantellerite, phonolite trachyte), but occurrences of basaltic and other compositions are known. Pumice stone is often pale in color, from white, cream, or gray, but can be green, brown, or black. When gases exsolving from viscous magma cores it forms bubbles which cannot easily decouple from the viscous magma before the cool glass. Pumice stone is a common product of explosive eruptions (Plinian and ignimbrite hematopoietic) and often forms zones in upper parts of the silicate lavas. Pumice stone has an average porosity of 90% and initially floats on the water.
Slag is different from pumice stone, poet, with larger vesicles and thicker vesicle walls; It sinks quickly. The difference is the result of the lower viscosity of magma that formed slag. When larger amounts of gas are present, the result is a more differentiated variety of pumice known as pumicite. Pumice stone is considered a glass because it has no crystal structure. Pumice stones differ in density according to the thickness of the solid material between the bubbles; many samples are floating in the water. After the Krakatau explosion, rafts of pumice stone drifted through the Pacific Ocean for up to 20 years with tree trunks floating under them. In fact, pumice rafts disperse and support several marine species. 1979, 1984, and 2006, underwater near Tonga created large volcanic eruptions of pumice rafts, some as large as 30 km, that floated hundreds of miles to Fiji.
Famous pumice deposits in Europe include Lipari Island (Italy), Santorini and Yali (Greece), as well as the Laacher See (Germany).

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