They develop by alternation of generation and are related to club mosses.
These plants have a reproductive organ called a strobilus, a terminal cone with whorls of sporangiophores. The single genus of these plants is Equistem. They develop by alternation of generation and are related to club mosses. For ten points, name these pteridophytes, or featherplants, which are members of the class Spenopsida, and which resemble parts of certain animals.
These plants have a reproductive organ called a strobilus, a terminal cone with whorls of sporangiophores.
horsetails (Accept early Equistem or Spenopsida)