Abstract The reproductive biology of five isolates of Catenella caespitosa from France, Puerto Rico and Brazil and seven isolates of C. nipae from Australia and the Philippines was investigated in culture. Most isolates exhibited a Polysiphonia-type life history and bisexual gametophytes. Mixed-phase reproduction occurred in one C. caespitosa isolate from Puerto Rico and one C. nipae isolate from Australia in which female segments of bisexual gametophytes developed zonately-divided tetrasporangia. In C. caespitosa, male and female segments were very similar in size and shape, whereas in C. nipae the segments were sexually dimorphic: the male segments being long, narrow and ringed by successive spermatangial sori, the female segments being short and round. Male and female gametangia were rarely produced together on individual segments. Tetrasporophytes and gametophytes of all isolates of C. caespitosa and C. nipae from field and culture samples contained iota-carrageenan, in contrast to C. nipae from Burma that Zablackis and Santos based their initial description of alpha-carrageenan. Introduction Catenella is widely distributed on mangroves of tropical and temperate coasts and is also known in tem: perate salt marshes and rocky habitats, including dikes and seawalls. Presently 4 species are recognized: 1. Catenella caespitosa (Withering) L. Irvine is
Botanica Marina – de Gruyter
Published: Jan 1, 1993
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