Fig. 4From: Protocol: an improved method for inducing sporophyte generation in the model moss Physcomitrium patens under nitrogen starvationReproductive cell differentiation of gametophores grown on all nitrogen conditions. a Mature antheridia containing differentiated sperms at 2−3 weeks after transfer onto the second medium. b Mature archegonia containing an egg at 2−3 weeks after transfer onto the second medium. c Stereoscopic images of the gametophore apexes at 8 weeks after transfer onto the second medium. The used media (from the first medium to the second medium) are indicated on the top of each panelBack to article page