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  • 1
    Electronic Resource
    Electronic Resource
    Heavy metals in water, ice and biological material from Spitsbergen, Svalbard (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Polar research 11 (1992), S. 0 
    Details
    ISSN: 1751-8369
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geography , Geosciences
    Notes: Concentrations of heavy metals Zn, Mn, Cu, Fe, Ni, Cr, Pb, Cd, Hg and Co were determined in surface waters, glacier ice and plant and animal materials from three regions in Spitsbergen, Svalbard. The concentrations of these metals in two samples of surface waters and in the vascular plants from Spitsbergen were found to be lower than what is commonly found in Cental Europe. Elevated concentrations were found in old ice from the surface of a glacier. The concentrations of heavy metals in algae were lower than in vascular plants. The concentrations of metals in the samples of feathers and animal hair from Spitsbergen were higher than what is common for Central Europe.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1751-8369.1992.tb00416.x
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  • 2
    Electronic Resource
    Electronic Resource
    Geitleribactron — eine neue,Chamaesiphon-ähnliche Blaualgengattung (1975)
    Springer
    Plant systematics and evolution 123 (1975), S. 263-281 
    Details
    ISSN: 1615-6110
    Keywords: Algae ; Cyanophyceae Geitleribactron ; Ultrastructure ; reproduction ; periphyton ; taxonomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In the littoral of the lakes Titisee (FRG) and Neusiedler See (Austria) and in a backwater near Stockerau (Austria) two periphytic unicellular blue-green algae with rod-like cells have been found. They were formerly thought to be members of the exosporine generaChamaesiphon orCyanophanon. Now the alga from Titisee was studied in culture, particularly with reference to cell division, reproduction and ultrastructural cytology. Similarities with the genusSynechococcus are evident, but there is a small mucilaginous disc at the basis of the cells. Because of differences between this and all other known genera of unicellular blue-green algae, a new genus,Geitleribactron, with two species,G. periphyticum (= type species) andG. subaequale, is described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00987060
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  • 3
    Electronic Resource
    Electronic Resource
    Cytomorphological characters supporting the taxonomic validity ofCyanothece (Cyanoprokaryota) (1998)
    Springer
    Plant systematics and evolution 210 (1998), S. 25-39 
    Details
    ISSN: 1615-6110
    Keywords: Cyanophyta ; Cyanobacteria ; Cyanothece ; Synechococcus ; Cyanobium ; Ultrastructure ; nucleoids ; taxonomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The fine structure of the type species of the genusCyanothece Komárek 1976,C. aeruginosa, is described and compared with the main cytological characteristics of morphologically related members of the generaCyanobium, Cyanobacterium andSynechococcus. Several morphological features, such as cell walls with thick outer layers containing a special type of vesicles, position of thylakoids, “keritomy” (net-like appearance of protoplast caused by arrangement of thylakoids, net-like nucleoids and/or by tendency to form intrathylakoidal spaces) and a special structure of mucilaginous envelopes were found to be characteristic of this genus, supporting its separate position among coccal cyanoprokaryotes (cyanobacteria, cyanophytes). The taxonomic significance of ultrastructural features in all mentioned genera is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00984725
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  • 4
    Electronic Resource
    Electronic Resource
    Bemerkungen zur Cönologie und Systematik der GattungHomoeothrix (Thur. exBorn. etFlah.)Kirchn. (1965)
    Springer
    Plant systematics and evolution 112 (1965), S. 424-441 
    Details
    ISSN: 1615-6110
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Zusammenfassung 1. Die Ansichten vonGeitler (1942, p. 175, 176),Margalef (1953) undStarmach (1959) über den systematischen Wert der GattungLeptochaete undAmphithrix und die Richtigkeit der taxonomischen Einreihung der nomenklatorischen Typen dieser Gattungen in der GattungHomoeothrix (Thur. exBorn. etFlah.)Kirchn. wurde bestätigt. Die Revision aller drei genannten Gattungen wurde durchgeführt, und neu gesammelte Proben aus dem Gebiete der Tschechoslowakei und der UdSSR wurden durchstudiert. 2. Alle genannten Gattungen (bzw. die Fadenabschnitte ihrer nomenklatorischen Typen) wurden vereinigt. „Homoeothrix (Thur. exBorn. etFlah.)Kirchn.“ wurde wegen ihrer taxonomischen Richtigkeit und allgemeinen Gebräuchlichkeit als „nomen conservandum“ für die einzige Gattung der Familie Rivulariaceae ohne Heterocysten vorgeschlagen. 3. Es wurde eine neue Blaualgengemeinschaft aus den fließenden Gewässern unweit von Leningrad (UdSSR) beschrieben, in der als DominanteH. margalefii nom. nov. auftritt. Sie ist der Gemeinschaft, welche von der polnischen Seite der Karpaten vonStarmach (1959) beschrieben wurde (mit der dominierendenHomoeothrix janthina), ähnlich. Neue Lokalitäten solcher Gemeinschaften wurden auch in der Tschechoslowakei gefunden. 4. Die Beschreibung der GattungHomoeothrix wurde ergänzt und präzisiert. Gleichzeitig wurden diakritische Merkmale festgestellt. Der Aspekt der Arten von steinigen Substraten wurde beschrieben. 5. Neue Lokalitäten vonHomoeothrix janthina, H. varians, Chlorogloea microcystoides undChamaesiphon polonicus in der Tschechoslowakei undHomoeothrix crustacea, Chlorogloea microcystoides undCalothrix braunii in der UdSSR wurden festgestellt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01372963
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  • 5
    Electronic Resource
    Electronic Resource
    Cell structure and reproduction process in the Blue-Green algaChamaesiphon (1982)
    Springer
    Plant systematics and evolution 139 (1982), S. 267-277 
    Details
    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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  • 6
    Electronic Resource
    Electronic Resource
    Trichome structure of fourAphanizomenon taxa (Cyanophyceae) from Czechoslovakia, with notes on the taxonomy and delimitation of the genus (1989)
    Springer
    Plant systematics and evolution 164 (1989), S. 47-64 
    Details
    ISSN: 1615-6110
    Keywords: Cyanophyta ; Cyanophyceae ; Nostocales ; Nostocaceae ; Aphanizomenon ; Anabaena ; Morphology ; morphometry ; variation ; trichome structure ; taxonomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The dimension and variation range of terminal and intercalary cells, heterocysts, and akinetes of fourAphanizomenon taxa occurring in Czechoslovakia were studied. Statistical and graphical procedures were used for evaluation. With regard toA. flos-aquae, the results support the distinction of two varieties (var.flos-aquae and var.klebahnii). In the samples determined asA. gracile two clearly distinguishable morphological types could be found; one of them is recognized as a new species:A. flexuosum. Its diacritical features are established and problems of the intrageneric taxonomy ofAphanizomenon and its demarcation from the genusAnabaena are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00940429
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  • 7
    Electronic Resource
    Electronic Resource
    On the validity of the genusDactylococcopsis (Cyanophyceae) (1969)
    Springer
    Plant systematics and evolution 117 (1969), S. 248-257 
    Details
    ISSN: 1615-6110
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The genusDactylococcopsis Hansg. 1888 (Cyanophyceae) is based on the typeD. rupestris, which was later identified as a green algae. Most of the many species described later were also placed to other groups of algae. Several authors even doubted about the existence of the genus. As, however, some species of Cyanophyceae correspond to the original generic diagnosis, the name “Dactylococcopsis Hansg. ex R. et F.Chod. 1925” has been proposed as a nomen conservandum, and a new type (D. smithii R. et F.Chod.) has been defined. Further speciesD. linearis Geitl. 1935 and D.Planctonica Teil. 1942 has been unambiguously described till now.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01409277
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