I've been corresponding with Dr.  creamy423 for some time. She's a good friend and a brilliant scientist, and due to her fascination with me and my unique species she's become something of a physician to me.
She's been keeping track of my progress since when we first met and keeps amazing records that go into great detail on everything I am and can do it seems, much more than I can keep up with, science talk make planty's head hurt, and she keeps an impressive amount of files on me, detailed drawings and charts she's made by hand littered amongst them. Sometimes she'll let me keep a copy that perhaps I can use to better explain myself and how I "function" to those thinking me just another shallow fantasy novel extra. This is one such document, detailing pretty much how I go between "modes" of travel/appearance in my base body, i.e. not resorting to my transformative abilities but simple re-aligning what all I've got on hand.

This one's called "The adaptive design of a herfollia isolate: an anatomical study " and includes the following image, and description beneath explaining it.
(I do think it's how I go from my stalk or sack forms to having legs.)

1. Standard bulb / whatever current form is
2. Roots come from the base to pinch around some of the bulb
3. The roots pinch tightly to push inner jelly upward.
4. Inner pressure rises enough to let whatever skirt of petals, leaves, or anything around Essy’s waist that it is time for legs, so anything about the waist begins to give inner fluids downward and curl in.
5. More pinches and getting jelly compacted
6. Roots wrap around enough and push upward to get some of the pinched off bulb to elongate into the start of the pseudopods. Still very soft and swollen right now. Petals/waist decoration closes up to form puffy collar full of jelly.
7. Jelly pressure high enough that plant structure inside can form up from the roots, making solid pilus stalks inside each leg for rigid support. Pseudopods get the fluid squeezed out of them to better enhance their final shape
8. Final touch up of things wiggling and shifting into place. Root system just about complete. Puffiness just about out of the pseudopods. The jelly pressure in the legs is now high enough that they wobble, but also have a shine, and are slightly sheer
9. All done!

Hopefully that was informative to folks who find knowing the little details of how things work to be a fun experience, hopefully this somehow assists in Herfollia awareness somehow as well.
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When you spend quite a stretch of time as your own invented species, you tend to do some world building, Erostia for me, and then go into the nitty gritty of anatomy, biology, and other science stuffs.
Well, I did, cause I'm a bit weird like that, and my awesome smart friends humor me and seem to get some amusement from assisting with this development.

Essrayle©Me
Dr. Cream© creamy423