| | |zoogonidium.|cell. |protoplasm. | | | |Sometimes | | | | |on dwarf | | | | |males. | -----------+-----------+---------+------------+----------+---------- Coleochæte.|Branched |Terminal |By | Differentiated. |threads, | or |zoogonidia |Antheridia|Oogonium, |or compact |marginal.|with two |four or |enlarged |circular | |cilia. |several |veg. cell, |plates. | |Any cell |from |with long | | |may form |single |tube through | | |a single |veg. cell.|opening | | |zoogonidium.| |of which | | | | |spermatozoid | | | | |enters. | | | | |After | | | | |fertilization | | | | |wall of | | | | |enveloping | | | | |threads | | | | |surrounds | | | | |oogonium. -----------+-----------+---------+------------+----------+----------