Cell wall deficient organisms are -
Chlamydia
Mycoplasma
Staphylococcus
Clostridium
Mycoplasmas(PPLO) are bacteria that are cell wall deficient and hence do not possess morphology (JOKER OF PLANT KINGDOM). They occur as round or oval bodies and as interlacing filaments
General Microbiology Pa 1 (History, Microscopy, Stains and Structure and Physiology of Bacteria)