116 



L. HILLIS-COLINVAUX 





^ liiiiiiiiiliitiliiifr 



Fig. si. H. renschii. Basal portion of specimen is extensively matted. Specimen from 

 Kenya, Diani, Isaac 3193. Scale bar is 2 cm. (Photograph from Hillis-Colmvaux, 

 1975.) 



Nodal medullary filaments uniting in pairs for a distance of 1-1-5 times 

 the filament diameter, sometimes fusing in groups of three, or filaments 

 remaining single. 



Lectotype specimen. Comoro Islands, Johannes Island, J. M. 

 Hildebrandt No. 1889 (L), designated by Hillis-Colinvaux (1975); 

 isotype material BM, C, PC, NY. The epithet brevicaulis appears 

 on some of this material, and its use cannot be readily explained 

 for macroscopically and microscopically the specimens so named are 

 the same as renschii. The taxon H. renschii is distinct from H. 

 brevicaulis from the Bahamas described by Kiitzing (1858). Some 

 sheets are also labelled with the orthographic variant H. reinshcii. 



Habitat. Growing in outer reef pools under moderate wave wash, 

 where it forms dense masses (Womersley and Bailey, 1970; Isaac, 

 1971). 



Geographic distribution. Eastern Indian Ocean; western Pacific 

 both north and south, south-eastern Pacific. 



