Marine Plants of Nha Trang — Dawson 
391 
ultimate segments; chromatophores rotund, 
about 3 M in diameter; reproduction not seen. 
TYPE; Holotype is Dawson 11248, Feb. 3, 
1953, in the U. S. National Herbarium. 
Type locality: Epiphytic on small filament- 
ous algae growing on coral taken from shal- 
low water of coral lagoon of Hon Mieu, Nha 
Trang Bay. 
Fig. 9. a, b, Derbesia attenuata: a, A portion of a plant of the type collection to show habit and branching (note; 
the primary axis has been somewhat shortened in the figure), X 35; a median dichotomy, X 200. c, d, Boodlea 
composita: c, A small portion of a mat, X 30; d, detail of a tenacula, X 68. e, Anadyomene wrightii: A portion of a 
young thallus showing only the larger cells, X 10,/, Caulerpa ambigua: Upper portion of an axis to show branching, 
X 65. g, Caulerpa fastigiata: A small part of a plant showing erect branches and sand-penetrating rhizoids, X 9. 
