94 



L. HILLIS-COLINVATJX 





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7 



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Fig. 22. fl^. incrassata. Basal portion of thallus showii is caulescent, and trilobed segments 

 are common towards branch extremities. Basal third is also more heavily epiphytized, 

 and appears to have functioned as perennating structure. Specimen from Curasao, 

 Spaanse Baai, south-east coast, 19 XI 62, Diaz-Piferrer. Scale bar is 2 cm long. 

 (Photograph by The Ohio State University Department of Photography.) 



Halimedea tridens Lamouroux (1812), p. 186; Halimeda tridens Lamouroux 

 (1816), p. 308; Collins (1909-1918), p. 398; Taylor (1928), p. 84, Plate 10, 

 Fig. 14; Taylor (1950), p. 92. 



? Halimeda brevicaulis Kiitzing (1858), p. 11, Plate 25, Fig. 2. 



Plants occasionally lax in habit, but more commonly erect and compact, 

 to 24 cm tall excluding the holdfast region, which may extend to 9 cm in 

 length ; calcification rather heavy at the base, becoming moderate to light in 

 the middle and upper portions; branching mainly di- to tetrachotomous, the 

 lower part of the plant often remaining simple for some distance, or branching 



