L'androceacute;e synantheacute;reacute; duRechsteineria cardinalis(Gesneacute;riaceacute;es). Une contribution au problegrave;me des fusions

摘要

The syngenesious androecium of theGesneriaceaeresults unquestionably from a postgenital union. Generally the stamens seem to remain entirely free from each other during the whole morphological differentiation process. InRechsteineria cardinalisthe contact between the anthers appears only after meiosis.In light microscopy the junction looks like an ordinary cohesion of the epidermis through the cuticles. Examination by electron microscopy reveals however a true discontinuity of the cuticles and also the complete absence of demarcation between the two united epidermises in the areas lacking cuticle. These two observations permit one to infer a real histological union or at least a metabolic reaction of the tissues united by synanthery.