Nichetum (None)

It appears there may be a typo or confusion with the term "Nichetum (None)," as it does not correspond to any recognized scientific or botanical concept. If you meant "niche" in ecology, it refers to the specific role or position a species has within its environment—what it eats, how it interacts with other organisms, and its habitat needs. Alternatively, if you’re referring to a different term, please clarify, and I’ll be happy to provide a clear, professional explanation.