Green ephedra is a dioecious species, meaning that an individual produces either male cones or female cones. The male cones form at the nodes of stems, and they sprout microsporangia, which release ...

1. In the microsporangia the sporogenous cells develop from hypodermal masses, 4 in number, in the usual fashion. 2. At maturity the innermost parietal layer appears crushed by the large tapetal cells ...