Is it possible that nuclear division in mushrooms represents an intermediate mechanism in the evolution of mitosis

Possibly, because karyokinesis, the division of a nucleus, is similar with that of the processes of mitosis and cytokinesis. It might be that nuclear division was an intermediate to mitosis which later developed to other cells. This means that because this replication is essential for the proliferation of cells, essentially, the mechanism that is mitosis should be vitally involved. 

chlorophyll a: this is the most abundant pigment in plants. chlorophyll a absorbs light with wavelengths of 430nm(blue) and 662nm(red). it reflects green light strongly so it appears green to us.

a motor homunculus represents a map of brain areas dedicated to motor processing for different anatomical divisions of the body.

homunculus represents the importance of various parts of your body as seen by your brain. as a result, they take up a lot of brain space. although the cortical homunculus is a curiosity, penfield's work in mapping the brain's relationship to the body was invaluable.