This is the metadata section. Skip to content viewer section. 1. The pollen grain contains two prothallial cells. 2. The second prothallial nucleus persists and is found later in the tip of the pollen ...

An analysis reveals that both sexual reproduction and early-embryo development in the moss Physcomitrella patens are controlled by cellular calcium influxes through ion-channel proteins. See Letter ...

1. When fruiting, Ricciocarpus is essentially a free floating plant. 2. The genus is strictly monoecious, though a small number of plants fail to produce archegonia. 3. Sex organs are produced in ...