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- Title
Delineation of the Genera Struvea Sonder and Phyllodictyon J. E. Gray (Cladophorales, Chlorophyta).
- Authors
Kratt, Gerald T.; Wynne, Michael J.
- Abstract
Plants of the stalked, net-forming green alga Struvea plumosa Sonder, the type species of the genus Struyea, divide segregatively at every stage of their multicellular differentiation. The segregative process re- suits in virtually simultaneous internal cleavage of the cytoplasts of parent axes or laterals into uni-senate series of nearly identically sized daughter cells in which intercalary cross-wall formation never takes place. Several branch orders result through a repeated process by which each daughter cell produces a pair of opposite protrusions at its distal end; the protruded arms subsequently undergo segregative divisions themselves after reaching a sufficient length. Struvea elegans Børgesen is seemingly the only other member of the genus in which the thallus divides by this segregative process. The remaining species appear to lack segregative cell division, their septime resulting from non-synchronous, centripetal wall ingrowth that divide parent cells into more or less equal halves. Intercalary cell divisions are common, this process being easily seen in the most widely distributed member of the genus, Struvea anastornosans (Harv.) Picc. et Grunov ex Picc. PhyIlodictyon J. E. Gray, based on Phyllodictyon puicherremum, is currently considered a synonym of Struvea but should be reinstated to accommodate those former species of Struvea that have Ciadophora-type, as opposed to segregative, cell division. Although the two genera thus diner substantially in their modes of cytokinesis and are assumed to represent independent developmental Pines, both Struvea and Phyllothctyon are assigned to the Cladophorales on the basis of molecular studies by others showing that recognition of the separate order Siphonociadales renders the Cladophorates paraphyletic. Plants of the stalked, net-forming green alga Struvea plurnosa Sonder, the type species of the genus Struyea, divide segregatively at every stage of their multicellular differentiation.
- Subjects
GREEN algae; ALGAE; CYTOPLASM; CELL division; CLADOPHORALES; PLANT physiology
- Publication
Phycological Research, 1996, Vol 44, Issue 3, p129
- ISSN
1322-0829
- Publication type
Article
- DOI
10.1111/j.1440-1835.1996.tb00042.x