These are very similar in form and life-cycle to the fungi but differ by the possession of chlorophyll or green colouring matter. They are found on damp surfaces on soil, rocks, stones, wood and the bark of trees. The earliest form of plant life known to man may well be similar to the algae found today on.
Seaweeds, which incidentally have considerable manurial value , are algae. Thegrowth known as ‘flannel weed’ is an alga. It can be destroyed by copper sulphate but this should only be used on expert advice as the wrong concentration will kill fish and ornamental water plants (aquatics).