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  • Angiosperms  (2)
  • 1990-1994
  • 1985-1989  (2)
  • 1988  (2)
  • 1
    Digitale Medien
    Digitale Medien
    Typology of latex starch grains of certainEuphorbiaceae and their possible significance in systematics (1988)
    Springer
    Plant systematics and evolution 160 (1988), S. 189-193 
    Details
    ISSN: 1615-6110
    Schlagwort(e): Angiosperms ; Euphorbiaceae ; Euphorbia ; Chamaesyce ; Latex starch grains ; phylogenetic and taxonomic implications
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Latex starch grains of certain Indian species ofEuphorbiaceae belonging toEuphorbia, Chamaesyce, Pedilanthus, Synadenium andMonadenium have been studied. They exhibit distinct shapes in different taxa, i.e., rod, spindle, osteoid, dumb-bell and discoid. This helps i.a. in the taxonomic circumscription ofChamaesyce fromEuphorbia.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00936046
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
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  • 2
    Digitale Medien
    Digitale Medien
    Studies in the embryology of the diandrous orchidCypripedium cordigerum (Cypripedieae, Orchidaceae) (1988)
    Springer
    Plant systematics and evolution 160 (1988), S. 159-168 
    Details
    ISSN: 1615-6110
    Schlagwort(e): Angiosperms ; Orchidaceae ; Cypripedieae ; Cypripedium cordigerum ; Embryology
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The anther wall layers ofCypripedium cordigerum are six to eight. The glandular tapetum is 2- or 3-layered and its cells are uninucleate. Simultaneous cytokinesis results in decussate, isobilateral and tetrahedral pollen tetrads. Ripe pollen grains are 2-celled. The mature ovules are anatropous, bitegmic and tenuinucellate. Both the integuments are dermal in origin and 2-layered. The inner integument alone forms the micropyle. The female gametophyte is 6-nucleate and bisporic. The reduction of nuclei is due to the “strike” phenomenon. Double fertilization occurs. The primary endosperm nucleus divides to form two free endosperm nuclei. The mature embryo is undifferentiated. The cells ca, m and n contribute to the embryo. The suspensor is single-celled. The seed coat is formed entirely by the outer layer of the outer integument. There are three sterile and three fertile valves in the ovary. In the prefertilization stages these valves consist of parenchymatous cells with starch and raphides. After fertilization, the sterile valves develop sclerotic cells whereas the fertile valves remain parenchymatous. The pericarp structure and embryological features support the retention of tribeCypripedieae within theOrchidaceae.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00936043
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
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