The synergids have special cellular thickenings at the micropylar tip called ___________

The synergids have special cellular thickenings at the micropylar tip called filiform apparatus. The filiform apparatus secretes some chemicals that guide the entry of pollen tube into the embryo sac.The neck canal cells are generally found in the archegonium of bryophytes and pteridophytes.The caruncle is also known as the strophiole.