Enteromorpha intestinalis (L.) Nees, 1820
The mature thallus is a hollow tube, wrinkled and convoluted, intestine-like and up to 11 cm long. Branching is from the base. The wall is one cell thick and the plant appears yellow green to dark green. The young plant is attached to the substratum by a basal rhizoidal cell. Older plants are free-floating. The cells are rectangular to polygonal in surface view, regularly and irregularly arranged and 10-16 microns in diameter.
Changi, Sembawang, Punggol
Asexual reproduction is by means of quadriflagellate zoospores formed from any cells except those from the basal area. Each cell may produce 4, 8, 16 or 32 zoospores. Escaping through an opening in the cell wall, they swarm for a while to settle on a convenient surface. There they divide to form a filament, with the basal cell becoming the holdfast. Sexual reproduction is isogamous, the pair of fusing biflagellate gametes coming from different plants. The resulting zygote germinates within a day or two to form a new plant.
Bold, H. C., C. J. Alexopoulos & T. Delevoryas, 1987. Morphology of plants and fungi. Harper & Row, New York. (5th ed.). 912pp.
Pham, M. N., Tan, H. T. W., Mitrovic, S. & Yeo, H. H. T., 2011. A checklist of the algae of Singapore. Singpore: Raffles Museum of Biodiversity Research, National University of Singapore. 100pp.
Prud’homme van Reine, W. F. & G. C. Trona Jr. (eds.), 2002. Plant resources of South-East Asia No. 15(1). Cryptogams: Algae. Prosea Foundation, Borgor, Indonesia. 318 pp.
Teo, L. W. & Y. C. Wee, 1983. Seaweeds of Singapore. Singapore University Press. 123 pp.