Don, stop ,posting photos, you're making it tougher!
I will try to remember to post decora shoot photos tomorrow, they are quite distinctive even when young.
David, I can see the similarity with bissetii but the blades do not quite look right nor do the new culms which for me are white powder covered on bissetii and much darker green.
I'm gonna be stubborn and still not rule out aurea but the blades are wrong for aurea, can you find the skinniest culms and photo the nodes? The shoot does not quite match anything I've seen lately and that does not leave much. The nodes do seem a bit pronounced, the blue under the node on new culms, the blades and the low branches keep me thinking aurea but surely the smaller culms would show a fat node even if the older ones do not and are not compressed.
Glauca, flexuosa, and iridescens all have similar blades but except for one shoot, the color seems to light for any of those. Iridescens, Flexuosa, Glauca notso, and Glauca yunzhu all are blue under the node but the shoots still seem too light - flexuosa shoots are quite magenta dark, iridescens are quite reddish dark and spotted even when young, glauca are kind of a mix of those 2.
When I eliminate all of the ones I think it is not, it doesn't leave much but the few above mentioned. I think you can rule out the following: aureosulcata forms, nigra forms, nuda, viridis forms, vivax forms, rubro, heteroclada forms, praecox, edulis, atrovaginata, parvifolia, dulcis, stimulosa, bambusoides
Here are some to still rule out - arcana, meyerii, angusta (usually lighter and spotted), propinqua (blaeds are usually slightly wrinkled) violescens?
_________________
Brad Salmon, zone 5b/6 Southern Indiana
Winters -20 to -25C. Summers 30 to 35C , humid. 115 cm annual precipitation, frost free from May through early October. 259.3 meters elevation. Growing 150+ species.
http://www.needmorebamboo.com/