[Taxacom] moss circles

[Mike Dallwitz]

> Aren't [grazing trails] typically more random and even looping 
> around and sometimes crossing back over themselves?

Not always - see Scribbly Gum Moth at
     http://www.anbg.gov.au/anbg/insects/ogmograptis.html
     http://www.csiro.au/resources/ps28j.html

Notice that the larva turns around and comes back parallel to its earlier 
track. The track never crosses itself.

For an explanation of moss rings, and diagrams of different patterns, see 
J.W. Wilson, 1951. Observations on Concentric 'Fairy Rings' in Arctic Moss 
Mat. J. Ecology 39, 407-416.
http://links.jstor.org/sici?sici=0022-0477%28195112%2939%3A2%3C407%3AOOC%27RI%3E2.0.CO%3B2-P&size=LARGE

-- 
Mike Dallwitz
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