ECOLOGY AND TAXONOMY OF HaUmeda 



271 



Table XXXI. Aragonite Content of Calcareous Caulebpales Other than 



HaUmeda'^ 



Species 



Description of material 



CaCOs 



in plant 



ig) 



%CaCO, 



dry wt per 



sample 



Penicillus 

 capitatus 



P. capitatus 



P. capitatus 



P. capitatus 



P. capitatus 



P. capitatus 

 p. capitatus 



P. capitatus 



P. capitatus^ 



P. ad lamourouxii 



P. lam,ourouxii'' 

 P. pyriformis'' 

 Rhipocephalus 



phoenix^ 

 R. sp.^ 

 Udotea flabellum 



U. flabellum, 

 U. flabellum 



U. flabellum'' 

 U. conglutifiata'' 

 U. cyathiform.is'' 

 U. ad spinulosa 

 U. wilsonii'' 



Plant almost exposed at low tide; 



3 cm tall, excl. holdfast, 1-7 cm 



broad ; young ; pale olive 

 Small young plant, capitulum 0-4 cm 



broad ; dark greenish-grey 

 Small young plant, capitulum 0-4 cm 



broad; dark greenish-grey 

 Mature plant, capitulum 3-7 cm 



broad; light olive -grey 

 Mature; capitulum 2-4 cm broad; 



light olive-grey 

 Mature ; capitulum 1 • 7 cm broad 

 Mature; capitulum 1-8 cm broad; 



light grey 

 Mature; capitulum 2-3 cm broad; 



light grey 



Mature; capitulum 3-5 cm broad; 

 light grey 



0-0565 



34-4 



Plant almost exposed at low tide; 



light yellow-green 

 Light yellow-green 

 Light yellow-green; holdfast shared 



with preceding plant 



Light yellow-gi'een 



0-2070 



0-2604 



0-0553 



0-0708 

 0-1416 



0-0422 



41-4 



55-9 

 34-6 



45-9 

 58-9 

 46-2 



54-4 

 33-3 



42-6 



47-2 



37-9 

 31-5 

 35-5 

 38-1 

 37-9 



" All data Hillis-Colinvaux (unpublished), except as below. 

 >> Bohm (1973a). 



(b) Yield of carbonate as dead segments from H. incrassata thalli. The 

 mean carbonate content of 299 fallen incrassata segments is 4-0 mg 

 (Table XXX). We now need to know how many such segments an 

 incrassata plant produces in a year, and for this the data are very 



