200 



L. HILLIS-COLINVAUX 



Fig. 62a. H. monile, covered with clusters of greenish gametangia. Scale bar is 1 cm. 



described by several workers, some of them having only preserved or dried 

 material to work with, and the review of reproduction for the genus 

 (Hillis, 1959) indicated that plants bearing these clusters were rarely 

 collected and were known for only nine species. 



The first workers to report these tiny globules, Derbes and Solier 

 (1856) and later Schmitz (1880), worked with fresh tuna from the Medi- 

 terranean. They noted not only the structures but the release from them 

 of bifiagellated zooids. For some time thereafter, the contents of the 

 globules were referred to, sometimes as zoospores, at other times as 

 gametes, and there was little support for the choice of term other than 



