Looks more like the underside of a peice of a fern leaf. Those emit fern spores, how fern reproduce.

Yeah i don't know what greens were mixed into it but it's not just the rose stems and leaves. There are spiney green leaves that kind of look like ferns i guess. Never seen any black dots like this on a fern before though; however I'm not much of an expert lol

Just Google "underside fern leaf" and see if you think it could be a match.

Yeah i think that's what it is. The photos online don't exactly match the size and shape, but the order and structure is really what gives it away

Isn't it so strange how it grows? Anyway I'm glad your mystery is solved.

When you put flowers in a vase of water, you need to strip off all the lowest leaves so that none are underwater. They begin to decompose and foul the water. Also the flower stems need a fresh diagonal cut at the bottom in case the original cut has callused over.

2 dozen "premium" roses for our anniversary on Tuesday

==>>>

lucky girl.. congrats ...

i hope this was just a curiosity.. more than a concern ...

agree with the above... make new cuts to extend the life of the flower ...

ken