Tropicals & Tender Perennials: Dividing Arisaema, seeds and ID., 1 by Badseed

Badseed wrote:
Hello All!

I have four Arisaema and one is growing and spreading particularly well. A friend was here and fell in love with one. I would like to dig it up to give her a corm but I'm not sure of the best time or method. I believe it's A. ringens. My chickens stole the tags on all but A. urashima. Ahem!

Second question. They appear to have seeds but the spathes have turned brown and curled over. They look like small light green seeds. How do I know if they are ripe/good?

Last. This is the plant in question, that I believe to be A. ringens.