When the fruit are ripe/mature thay will begin falling off the
spadix. Clean the outer covering off the seeds (the seeds pulp out
when the ripe fruit is squeezed between finger and thumb) wash-rinse
the seeds off in water in a fine strainer, sow the seed in chopped
wet sphagnum in a large zip-loc bag kept in a warm, bright area out
of any direct sun. When the seedlings are large enough transplant to
small pots w/ a suitable loose, well draining mix.
My anthurium gracile has some nice red berries on it. I would
appreciate any recommendations on when to pick them and any seed
growing culture tips.