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  • 1
    Electronic Resource
    Electronic Resource
    Observations on the morphology, reproduction and cytology of stigeoclonium pascheri (vischer) cox et bold (chaetophorales-chlorophyceae) and their bearing on the validity of the genus caespitella vischer (1980)
    Springer
    Hydrobiologia 70 (1980), S. 83-93 
    Details
    ISSN: 1573-5117
    Keywords: Morphology ; cultural variation ; reproduction ; cytology ; Stigeoclonium pascheri ; validity of Caespitella
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The present communication deals with the morphology, reproduction and cytology of Stigeoclonium pascheri (formerly described as Caespitella pascheri Vischer). Effects of various concentrations of nitrate and variations in intensity and duration of light period in 24 hr LD cycles were studied on cultures of this alga in relation to the type and extent of branching and occurrence or absence of hair formation. It is concluded that these traits are not of taxonomic significance and are influenced largely by environmental conditions. The present study shows a large overlapping of morphological characters between the genera Stigeoclonium and Caespitella and supports Cox & Bold's abandonment of the latter generic name and its merger into the genus Stigeoclonium. The chromosome number determined for this alga is n = 6 which indicates that the Indian strain of this alga is a distinct cytotype from the one originally isolated by Vischer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00015494
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Morphological and cytological investigations ofUlothrix zonata and taxonomy of the related species (1980)
    Springer
    Plant systematics and evolution 135 (1980), S. 151-158 
    Details
    ISSN: 1615-6110
    Keywords: Ulothrix ; Ulotrichales ; Ohlorophyceae ; Morphology ; reproduction ; cytology ; polymorphism ; taxonomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The present communication deals with the observations made on the morphology, reproduction and cytology ofUlothrix zonata (Weber & Mohr)Kütz. in culture. The alga displays a remarkable phenotypic plasticity in nature as well as in culture. The present study provides additional evidence of karyology in support ofLokhorst andVroman's treatment ofU. zonata which merges a number of earlier described species in it. The cytological details and chromosome number (n = 10) determined for the Indian isolates ofU. zonata agree with those ofSarma for the British material.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00983183
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    Paper (German National Licenses)
    Fulltext
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