Fig. 28. H. macroloba. (Top) Specimen from Kenya. Malindi, on the reef fiat, 4 IV 66, 

 Isaac 2972. (Photograph by Jodi Grenga.) (Bottom) A grove of macroloba exposed 

 at low tide, Nuku Alofa, Tonga, April. (Photograph by R. Lewin, reproduced with 

 permission.) 



