ISSN:
1615-6110
Keywords:
Cyanophyceae
;
Chamaesiphonales
;
Chamaesiphon
;
Ultrathin sections
;
cell wall
;
cell structures
;
cell division
;
taxonomy
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract Ultrathin sections were studied in 2 strains and 2 samples from the nature of the genusChamaesiphon, representing 4 different species. Thylakoids are distributed mainly on the periphery of the cells, the cell-wall is probably 2-layered, and variable multilayered mucilaginous envelopes are developed around the cells. The cell division starts, as well as in otherCyanophyceae, by the invagination of the cytoplasmic membrane and of cell-wall layers into the protoplast; the mucilaginous envelopes—pseudovaginae—do not participate in this process but they form only the firm sheaths around the cells. The way of reproduction is, therefore, essentially the same as that described in other chroococcal Blue-Green algae (e.g.,Synechococcus), and the main difference is the polarized growth of theChamaesiphon cells. The taxonomical position of chamaesiphonoid algae is not as isolated as it was earlier supposed, the similarity withEntophysalidaceae is evident.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00989329
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