I'm not sure about that's a bug, but i wanted to report it. While i was investigating some NBT keys at "http://minecraft.gamepedia.com/", i have found a code "/summon Item ~1 ~0 ~1 {Item:brown_mushroom}" then i wanted to try it. After typing this, i'm getting this error: "An unknown error occurred while attempting to perform this command". Only "/summon Item ~1 ~0 ~1" summons a stone (probably being it's first item) but when i bring this NBT key near on it, it gives error. Absolutely: there were no mod or plugins while i testing this command.
If that is not a bug, sorry
Source: http://minecraft.gamepedia.com/Tutorials/Command_Block
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No, those names are only usable via the /give command. The ID for an item is stored as a short, not a string so this would be impossible.
Should be: