I've been perplexed by the absence of the main stand of P. escritata orchids I discovered several years ago in the north tract.
I finally learned what apparently happened.
The preparation work for the prescribed fire that involved mechanical clearing apparently damaged the corms to the point they will not produce additional plants.
Another spot was damaged by the widening of the fire lane north of this site.
That means the only extant site for this species on the preserve may be in the south tract, which has not been disturbed.
I'll have to dig up by old GPS data and see if I can relocate that site.