In nomenclature, what does "cf" mean?

[Darvin DeShazer]

In article <6dafee1b.0201072006.1d57f161 at posting.google.com>,
 dwheeler at ipns.com (Daniel B. Wheeler) wrote:

> In reading my of my older McIlvania's, I came across A(manita). cf.
> rubescens. What does the cf. stand for? I have seen the reference in
> some of my collections as well, but do not recognize the reference.
> 
> Daniel B. Wheeler
> www.oregonwhitetruffles.com

cf = closest fit
So, Amanita rubescens cf.  would mean it keys to Amanita rubescens, but 
it does not match the description exactly.  However, it is the closest 
fit that can be found and is very similar to that mushroom.
Darvin
http://SOMAmushrooms.org