Couple more pics: Another pic of P. lusitanica.. these flowers are so small And my P. gigantea has begun blooming too! I got a dark flowered clone... I have tried crossing this one with the P. moranensis x ehlersiae, but if that doesn't work I might try the next flower with the P. rotundiflora x hemiepiphytica that's about to bloom as well.
Getting P. lusitanica seed to germinate is not a problem for me. Volunteer seedlings come up all over the place without any intervention (similar to D. capensis). Fortunately, both P. lusitanica and D. capensis are easily identified, compared to many other volunteer (escaped) Pinguicula and Drosera.
Agreed with Bob, I'm thinking problems would likely stem from seed age. Mine have been cold stored for a while, but each new attempt always brings good germination in typical warm conditions any tropical/subtropical plant likes. Seeds that are not cold stored, however, are likely to go bad very quickly.
I purchased my seeds from the ICPS seed bank in 2013 a few weeks after they became available, I sowed it on pure peat since that was all that I had at the time around the middle of October and they have been sitting on my window ever since. The bags get diffused light all day and are kept moderately moist. The only thing that has started are a few tiny sprigs of sphagnum. Thanks for the help!
Aside from increasing the moisture (mine stay fairly wet all the time), can't see anything wrong with your conditions. Could just be an issue with the seeds. If that's the case, mine have just begun producing seeds, I may be able to help there.