Letters to the Editor
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"...look the same under an electron microscope"???
You don't identify bacteria by their appearance under an electron microscope. Bacillus anthrax and its nonpathogenic relatives such as Bacillus subtilis and Bacillus thuringiensis all form spores, but they probably all look about the same in electron microscopy. Different strains of the same species probably differ even less.
In 2003 that two Berkeley scientists suggested a way to differentiate spores of various Bacillus species using light microscopy.
http://www.berkeley.edu/news/media/releases/2003/02/10_spores.shtml
Though this 2003 press release doesn't say yea or nay, I doubt anyone has worked out a way to tell the spores apart with an electron microscope. If there were an accepted way of doing that, I think the report would mention it and compare the two methods.
The way you identify spores is to culture them and do various tests, mostly biological and biochemical, on them.
If somebody cites electron micrograph appearance as evidence that Bacillus spores are Bacillus anthrax, I'd say he's showing mostly his gullibility.