Osservazioni Sulle Infrastrutture diAnabaena CycadinaeE delle Cellule dei Tubercoli Radicali diCycas Revoluta

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Abstract
Observations on the infrastructures of ANABAENA CYCADINAE and of root-nodules cells of CYCAS REVOLUTA. — Light and electron microscope observations carried on the fine and ultrafine sections of root-nodules of Cycas revoluta, brought in evidence differences structural and infrastructural of cells. These differences concern mainly the modifications presented by reticulum endoplasmic which in middle-aged cells takes a fragmentary and vescicular aspect, and the mitochondria which, in the same cells, show short cristae starting by outside wall of the organul. About the plastyds, I could bring in evidence that there is plenty of leucoplasts but the proplastyds are still numerous, as the cloroplastyds showing some development of the lamellar system and of grana. Plastyds green are present either in while nodules, either in the root-tops. In no nodules it has been possible to point out the presence of bacteria while it has been possible to verify that Algae have some polymorphism of structure because the chromatoplasma may result essentially of tree different aspects, by me, indicated as reticular type (fig. 12), lamellar type (fig. 10) and type at mixed structure (fig. 11).

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