Just guessing but still very difficult to tell. I think you need some bigger shoots (~1") to see better. Bissetii is supposed to get oral setae on the culm sheaths, probably midculm height, but I haven't observed any on my Bisset yet either (largest shoot around 1/2" diameter). Still it could be P. nuda or some other green Phyllostachys. Great help huh?

The top pic looks very simular to my yellow groove that just sprouted...take a look.
CJ
{{gwi:423375}}