Sunday, August 5, 2018

The Blob in real life



A review of "Myxomycetes: A Handbook of Slime Molds".

Did you know that the classic horror movie "The Blob" is freely based on a true story?

Well, *very* freely...

Slime molds are a curious and often overlooked group of organisms, defying all attempts at classification. Are they fungi? Are they animals? Or something else entirely? Currently, most slime molds are believed to be related to amoebae. But then, what on earth is an amoeba? Previously classified as animals, they are now an independent "kingdom".

Slime molds have a complicated life cycle. Their most notorious phase is the plasmodium, actually a multinucleate cell. The plasmodium is bloblike, slimy and can become quite large (the size, say, of a mushroom). Also, it can move around. Often, the plasmodia are brightly coloured as well. This created quite a panic in a suburb of Dallas, Texas in 1973. The yellow plasmodia of the slime mold species Fuligo septica suddenly appeared on people's lawns, and when blasted with water, broke apart - with the parts continuing to slowly creep around, even getting somewhat bigger! Naturally, people panicked and assumed UFOs had something to do with it. Or had they just been watching "The Blob" too much? Eventually, the plasmodium settles down and becomes a fruiting body with spores. It's this strange life cycle, combining an amoeba-like stage and a fungus-like stage, which has long baffled researchers.

"Myxomycetes" is a good introduction to these organisms. The book is intended as a field guide to 175 species of slime molds found in eastern North America, but since most species are cosmopolitan, the book can probably be used in Europe as well. It should be noted that all illustrations are in black and white. Many of these creatures are extremely small, and found only in decaying wood or litter. Still, it's a pity that no colour plates of the more dramatic species have been included (such as the previously mentioned Fuligo septica).

Apart from the species presentations, "Myxomycetes" contain chapters on how to collect and study slime molds, their geographical distribution, and their ecology. There is also a reference section.

Apparently, slime molds prefer the temperate region, being less abundant in the tropics. They can be found in deserts and in the hills, but they prefer woods where they grow on bark, litter or dung. Some insects have specialized in attacking slime molds, including the slime mold beetles and the slime mold fly (which, however, may help them spread the spores). In the Mexican state of Veracruz, some of the natives actually eat our old friend Fuligo septica! They call it "moon feces", while the preferred English term is "dog vomit".

Personally, I just call it The Blob...

Finally, a word of warning. This is a typical book for nerds. If you don't already have a strong interest in slime molds, fungi or perhaps amoebae, I don't think you will appreciate it. Buy a more popularized book on mushrooms first! However, if you are one of those nature-lovers who just love to poke around in the litter, or look under the bark of trees, "Myxomycetes" might come in handy.

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