Abstract
The root nodules of lupine have a number of separated bacteroid tissue with a varying amount of non-infected tissue between them. Very often, infected threads are prominent in the young nodules. The leguminous nodules can be placed in four groups with respect to the mode of infection of the bacteroid tissue. 1. Infection is produced by aid of infection threads. a) By intracellular threads. For example, Broad bean. b) By intercellular threads. For example, Serradella. 2. Infection is extended by aid of cell divisions. c) By mitotic cell divisions. For example, Lupine. d) By amitotic cell divisions. For example, Soy bean.
