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Planctomycetes are Gram-negative spherical cells which reproduce by budding. They lack peptidoglycan in their cell walls. A few rare Planctomycetes, such as Gemmata obscuriglobus (right), actually have a membrane-enclosed nuclear body.
Bergey's Manual Volume 5: The Planctomycetes, Spriochaetes, Fibrobacteres, Bacteriodetes and Fusobacteria