Does anyone out there know how to induce the formation of sporangia on
greenhouse-grown Psilotum? For four years I have grown nice, lush,
dark-green Psilotum plants in the greenhouse, but they lack the nice,
yellow sporangia. Is there some photoperiod, temperature, nutritional
state, etc. that I am overlooking? Six years ago my Psilotums
produced sporangia and then, all of a sudden, they stopped. I am not
doing anything different, as far as I know; help...