Hi all,
If you can find
Philodendron scandens it is very similar, but all green. <
http://apps.rhs.org.uk/plantselector/plant?plantid=1424>.
I think the reason there isn't a green Pothos, is that the standard green/gold Pothos (
Epipremnum aureum), is naturally variegated
http://www.springerlink.com/content/d005p75vg1171860/fulltext.pdf.
Hung, C. & Xie, J.(2009)
Biologia Plantarum, 53:4, pp. 610-616,
"A comparison of plants regenerated from a variegated
Epipremnum aureum"
In order to study chloroplast biogenesis, we chose natural variegated Epipremnum aureum (golden pothos) and regenerated pale yellow, variegated and green plants from all three types of tissue explants
Variegation often is viral, but you tend to get a mottled effect (like
Abutilon pictum "Thompsonii", which has "Abutilon Mottle Virus".
There is also a "Colour Break Virus" that they use deliberately in tissue culture to create variegated effects.
I've just found that a lot of variegation is now thought to be chimeral, where there is a mixture of chloroplasts that are normal (green) and mutant (colorless) <
http://en.wikipedia.org/wiki/Chimera_(plant)>. When cells divide, mutant/normal chloroplasts are randomly assorted into the new cells. Some cells end up with more normal chloroplasts, some with more mutant ones. I'm pretty sure this is what happens with very variegated Pothos "Marble Queen", which has very little chlorophyll and is a very slow grower, that has then been cloned from an original sport.
cheers Darrel