title: Fine structure of vegetative mycelium and spores of Nocardia spp.
abstract: The fine structure of a fragmenting and sporulating mycelium of cultures of actinomycetes possessing biochemical properties characteristic of the genus Nocardia--a cell wall of type IV and lipid LCN a--was studied. It was found that fragmenting  hyphae are similar in structure to the vegetative hyphae of known actinomycetes. Sporulation takes place through the simultaneous division of a sporulating hypha by numerous septa. Spores differ from vegetative cells in the presence of a thickened electron-dense cell wall, dense internal contents, and the presence of vacuoles.
mesh_terms: D008854:Microscopy, Electron; D009615:Nocardia / Q000648:ultrastructure*; D013045:Species Specificity; D013171:Spores, Bacterial / Q000648:ultrastructure