Saturday 28 June 2014

Himalayan viagra - an odd story of libido, caterpillars and mushrooms

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This is the tale of Ophiocordyceps sinesis or, if you're more poetic, the Mysterious Caterpillar Mushroom or even, as the Chinese name it - Winter Worm, Summer Grass:

It preys specifically on the larvae of several species of ghost moths in the Thitarodes genus. Spores infect the larvae while they live underground before pupating. The spores germinate and mycelium grows, killing and mummifying the larva/caterpillar. Eventually a fruiting body grows from the mummified larva and pops above ground, reminiscent of something from an awesome science fiction movie. 

So there you have it - a weird mushroom that grows from out of a dead caterpillar's head. And the Chinese can't get enough of it because it is believed to do great things for the immune system and (hence the Himalayan viagra tag) treat erectile dysfunction. And, not surprisingly, the result is that this wonderful little ecosystem is threatened by overharvesting:

“There is a similar trend in other Himalayan countries, such as China, India and Bhutan,” says Liu Xingzhong, a mycologist in the Chinese Academy of Sciences’ Institute of Microbiology in Beijing. On the Tibetan plateau, for instance, the fungus harvest per unit area has dropped by 10 to 30 percent compared with three decades ago....

In one respect, this problem is a reflection of how the myths of libido are so rapacious. This little mushroom may not be as grand as a rhino or as magnificent as a tiger but its decline is for the same reason - the sex drive of Chinese men. But, just as with those great wild mammals, the heart of the problem is the tragedy of the commons - up on the Tibetan plateau no-one owns the places where the caterpillars and their mycological hosts do their thing. And the result is overharvesting and fights over 'territory'. As collectively-owned places, Chinese national parks provide no incentive to limit either the amounts harvested or the numbers of harvesters.
 
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