In this article we will discuss about the external morphology of ectocarpus. 1. Plant body consists of thin, well-branched, brown- coloured filaments arranged in heterotrichous form. 2. Heterotrichousthallus is differentiated into a prostrate system and an erect system (Fig. 36 A-D). 3. Prostrate system is creeping, septate, profusely branched and attaches the plant with the […]