Plate VI. 



Structures of Various Plant Fouling Organisms. 



F/g. 34 



Fig. 28. — Branch of an Ectocarpus, with four of the characteristic reproductive organs ; cell contents 

 only shown at the base. X 100. Fig. 29. — Portion of a thread of Ulothrix fiacca. X 150. 



Fig. 30. — ^Two individuals of Licmophora, seated on the end of the branches of the mucilage 

 stalk and seen in different positions, x 300. Fig. 31. — Single individual of Schizonema. 



X 700. Fig. 32. — Cell of Achnanthes at end of mucilage stalk, x 250. Fig. 33. — 



Tip of a Cladophora, showing shape of cells and manner of branching, x 100. Fig. 34. — 



Two tiers of a Polysiphonia, with four peripheral cells surrounding the single central one. X 400. 

 Fig. 35. — Small part of a Cladophora at a point of branching, showing cell contents and the thick 

 walls. X 350. Fig. 36. — Small part of a strand of Enteromorpha. x 150. Fig. 37.— 



Tip of a thread of Urospora; the two uppermost cells with reproductive cells. X 150. 



[Fouling of Ships. 



