Taxonomy, biology and cytology of four species of Stigeoclonium (Chaetophorales, Chlorophyceae) from Argentina.

MICHETTI, KARINA MARIEL; LEONARDI, PATRICIA INÉS; CÁCERES, EDUARDO JORGE

PHYCOLOGICAL RESEARCH (PRINT)

WILEY-BLACKWELL PUBLISHING, INC

Lugar: Kochi, Japon; Año: 2010 vol. 58 p. 35 - 43

1322-0829

Four species of Stigeoclonium from Argentina werestudied by means of transmission electron microscopyand light microscopy. For species identification, wecollected data related to the prostrate system andzoospore germination. We also determined the chromosomenumber for each species. Stigeoclonium aestivaleshowed a more developed erect system than the prostrateone, zoospore germination was predominantly oferect type and the chromosome number was 8. Stigeocloniumtenue presented well developed, erect andprostrate systems, zoospore germination was initially ofthe prostrate type and the chromosome number was 5.In Stigeoclonium variabile the prostrate system predominatedover the erect one, zoospore germinationwas strictly of the prostrate type and the chromosomenumber was 3. Stigeoclonium farctum presented amore developed prostrate system than the erect one,zoospore germination was strictly of the prostrate typeand the chromosome number was 8. The ontogeny ofthe zoospore germination was related to the final relativedevelopment of the prostrate and erect portions ofadult thalli.