Myxomycetes a.k.a. Slime Molds
March 25, 2010
Slime molds are fungus-like organisms that have previously been classified as fungi, and later as Myxomycetes. They are no longer classified as fungi. Depending on the sources, there are now two or three different groups of slime molds, one of which is the myxomycetes. These now fall under the broader category of eukarya.
In general however, slime molds are characterized by the production of relatively large, single-celled, multinucleate bodies called plasmodia (singular = plasmodium). Plasmodia are the feeding stages of slime molds, and they are frequently seen on lawns, small plants, mulch, and decaying wood in late summer. Slime molds are not plant parasites, but they may injure plants by covering and shading them. (text from Cornell University Plantclinic)
From the introduction to Steven Johnson’s 2001 book, Emergence: If you’re reading these words during the summer in a suburban or rural part of the world, chances are somewhere near you a slime mold is growing. Walk through a normally cool, damp section of a forest on a dry and sunny day, or sift through the bark mulch that lies on a garden floor, and you may find a grotesque substance coating a few inches of rotting wood. On first inspection, the reddish orange mass suggests that the neighbor’s dog has eaten something disagreeable, but if you observe the slime mold over several days — or, even better, capture it with time-lapse photography — you’ll discover that it moves, ever so slowly, across the soil. If the weather conditions grow wetter and cooler, you may return to the same spot and find the creature has disappeared altogether. Has it wandered off to some other part of the forest? Or somehow vanished into thin air, like a puddle of water evaporating?
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