[Inkscape-devel] l-system fern formula

I'm trying to draw fern pattern using l-system, I found a formula on a website that says you get this:

http://www.home.aone.net.au/~byzantium/ferns/leaf34.gif

if you use this formula(s):

angle 8 axiom x a=n n=o o=p p=x b=e e=h h=j j=y x=F[+A(4)]Fy y=F[-B(4)]Fx F=@1.18F@...1985...

(I separated rules with ; )

But the result I got doesn't match: http://img143.imageshack.us/img143/1948/fernmt4.png

Is this a bug in l-system, or are these rules wrong, or am I using the effect wrong?

btw the image I got was made with order 34 as the website suggested, but it takes a long while till Inkscape calculates it (nearly 100000 nodes), I'd suggest a much lower order for testing ;)