Elements of the Stanley-Reisner ring

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I have a simplicial complex, and I'm trying to manipulate the Stanley-Reisner ring of that simplicial complex. This is just a quotient of a polynomial ring. The generators of the quotient ring are called (according to R.gens()) x0bar, x1bar, x2bar, x3bar. However, when I try to refer to elements of the ring in this way (for example, to create an ideal containing certain elements), I get an error. For example:

sage: X = SimplicialComplex([[1,2,3], [0,2,3], [0,1,3]])
sage: R = X.stanley_reisner_ring()
sage: R(x0bar)

This gives me the following error:

NameError                                 Traceback (most recent call last)
<ipython-input-3-b65205a640d6> in <module>()
----> 1 R(x0bar)

NameError: name 'x0bar' is not defined