An article on the Guardian website provides evidence of how alien species can be unintentionally spread around, caused merely walking in a particular area and picking up spores (or seeds) on footwear.
"Scientists have discovered an unexpected leftover of the first world war on a Scottish university campus. A fungus, foreign to Scotland but relatively common in Europe, has been found growing in the grounds of the former Craiglockhart hospital where war poets Siegfried Sassoon and Wilfred Owen met in 1917.
"Its discoverer, ecologist Abbie Patterson, believes British troops who visited Craiglockhart for treatment for shell shock brought Clavulinopsis cinereoides to Scotland after picking up spores on their boots while tramping through the mud of Flanders."
http://www.theguardian.com/world/2014/jan/18/boots-first-world-war-troops-scotland-fungus
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