Abstract
The development of a proteinaceous substance involved in both wound-healing and the formation of basal septa in a siphonous green alga is described. The protein accumulates within swollen cisternae of the endoplasmic reticulum. In the later stages of development the protein is cleaved by numerous complex fracture planes. The mature protein bodies pass into the large central vacuolar system where they lose their limiting membrane. The naked protein body is then broken down, first into rodlike structures, then into a granular-fibrillar substance. It is chiefly in this latter form that the protein participates in the formation of wound walls and basal septa of branches.
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