The fact is that Tuscan is a dialect of Italian, or to state it more correctly, Standard Italian is a decayed form of Classical Florentine literary Tuscan.
But while it could have been true until fifty years ago that Tuscan and Italian were synonyms now this is no more.
This upsets in particular the Tuscans who, in my experience, feel offended when someone says that Contemporary Standard Italian is "Tuscan" (and at the same time they get offended if someone calls Tuscan a dialect of Italian!)
On the other hand I can testify that here in the North when I unintenionally spoke some sentences in a slightly Tuscanised speech everyone asks me within a few minutes: "Why on earth are you speaking Tuscan?"
And on top of that it is not even so simple to understand undiluted vernacular Tuscan for the average Italian speaker, as IpseDixit has said.
Anyway what is a dialect and what is a language is quite a controversial topic in Italy and I do not think it is relevant to discuss it here.
What I think is relevant is that on Unilang it might be useful to add as subcodes the following "dialects" of Italian:
Code: it-tus
English name: Tuscan (language)
Native name: vernaholo toscano
Flag:
http://en.wikipedia.org/wiki/File:Flag_of_Tuscany.svgWikipedia page:
http://en.wikipedia.org/wiki/Tuscan_language(I know that the flag of the Grand Duchy of Tuscany looked nicer, but it did not include Lucca, which was an independent city at that time)
Code: it-rm
English name: Romanesco
Native name: romanesco
Flag:
http://en.wikipedia.org/wiki/File:Flag_of_Rome.svgWikipedia page:
http://en.wikipedia.org/wiki/Romanesco_dialectCode: it_old
English name: Old Italian
Native name: volgar lingua / volgare fiorentino
Flag:
http://en.wikipedia.org/wiki/File:Flag_of_Florence.svgWikipedia page:
http://en.wikipedia.org/wiki/Old_Italian#Middle_AgesThey are enough different from Standard Italian to be probably worthy of a code and a flag on Unilang, especially considering that many European languages, and Romance languages in particular, here have plenty of subcodes, while Italian has none.
More importantly I think that these "dialects" could be interesting for users to add to their profiles, because they are often studied as separate languages by both native Italians and foreigners.