Fortunately there are not that many tropical Stachygynandrumous species available in the market! Check the image at the link below and run your pointer across the image to see the id pop-up.
Very nice. Hope it does well for you.
You may need to cover it during the day to increase humidity and keep it warm around 70F (prob survives from
65F into 85F). Needs high humidity (70% min to 85%).

Here is a link that might be useful: Selaginella martensii

Thank you terrestrial man.
I will take great care of my Selaginella martensii.
Regards.