The bulbs I have of Cyrtanthus [montanus X elatus] have almost always
been
infertile too. I got luck one single time, pollinating one bulb's
flowers
onto the flowers of another of the bulbs that was in bloom at the same
time
and the reverse. One of the two plants set two pods, and I got maybe 6
seeds. The last time I checked, the pot of those seedlings had 4 nice
bulbs in it, ca. 1 inch in diameter. I'm very curious to see what their
eventual flowers will look like, and to see if these F2 plants are more
fertile than their parents. In a few more years.....