Opionions about Dendrophylax lindenii needed.

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Recall orchids in habitat live with endosymbiont fungi. It is likely the fungi are very important for the orchid. If the fungal hyphae extend outside the orchid they will be able to import minerals and other nutrients the orchid might otherwise have trouble getting.

Cycads live with endosymbiont cyanobacteria, which are able to fix gaseous nitrogen and provide nitrogen to the cycads in low-nutrition environments. Cycads have specialized coralloid roots to host the cyanobacteria.

Many cacti in habitat look as though they are heavily fertilized with nitrogen. But there is very little nitrogen in their environment. Cyanobacteria called Nostoc live in most desert environments. They are easy to find. During the dry season look for a thin crust of dark organic matter in areas where water would linger longest after rain. It has been hypothesized for years that this is the source of nitrogen for the cacti but it has not been studied.