Forgot to mention that...

The species name is not listed on the major listing of
Huperzia species of the world.
There are almost 400 species in the world and prob. 20 or so in Mexico (am guessing). You can check the listing out at the link below.
Be sure the plant is in a very humid and shaded spot which is not subject to wind. Prolonged cold spells will set it back recommend mins in the 50s or 60s.

Here is a link that might be useful: Huperzia species of the world listing

Terrestrial,it IS LISTED-lol. Right after H.cubana.First discovered 1906,moved to Huperzia in 1985. It's said to be happy from 40-90F-easily I'm told.
There is a photo on the net of one outdoors in SouCal,hanging under shadecloth.No humid greenhouse..just plain shadecloth and L.A. humidity. Kept well watered no doubt.
I think its a great find.I hope it grows well enough for me to propagate. Cross fingers.

Thanks for the correction! Was thinking que...... ??????
Next time I will use my magnifying glasses!!!

Don't let an image fool you on culture. Probably watered
every day ?????

One interesting fact i have learned already: It's heavy plant. Much heavier than a H.squarrosa. The feel is like a small branch of spruce-or Douglas fir. Heavy duty.That might explain why it does so well in lower humidity.

Not knowing the species it is hard to say but the ability to withstand less water or drought conditions is tied to a combination of water storage tissues and/or water dessication characteristics of the plant.
Generally a dryish thick cuticle covering the leaves and stems with furrowing of the stems. the fact the leaves are tightly appressed to the stem is another attribute of preventing dryness. It would be interesting to find out how the plant responds to watering: do the leaves open up more? Or do they stay tight against the stems? Also how are the leaves oriented to the sun.
Even though this is an epiphyte I would venture to guess that the rhizoids that anchor the plant to the media or mount would prefer it cooler than as warm as the leaves get exposed to whatever light and wind occurs. This is a feature of the Northern species which make their culture somewhat challenging.
Hope to learn more about your plant!!!