Minecraft mushroom houses?

.According to the Minecraft Wiki, no.

The Xbox edition only has things starting in Minecraft Beta 1.6.6, and the mushroom biomes (therefore the large mushrooms) were introduced in Minecraft Beta 1.7.

However, I'd expect it to be added in a near-future update, although when that'll be, who knows?

Also, not quite what people think is a "Botany" question. Glad to answer, but you might get things quicker if you categorize it right.

Besides that, have fun and ask on.