Phyllodialdornen beiNeoalsomitra podagrica van Steenis (Cucurbitaceae)

The thickened shoot bases ofNeoalsomitra podagrica carry spines of an undescribed nature: they represent morphologically phyllodes. A closed ring of sclerenchyma originating from the fusion of vascular bundle sheaths is responsible for the rigidity of these organs. Contrary to their cylindric structure these phyllodes are to be considered as bifacial. Between the region of phyllodial spines and foliage leaves there is a transition zone with petiole spines characterized by secondary loss of rudimentary leaf blades.

Herrn Prof. Dr.W. Leinfellner zum 65. Geburtstag gewidmet.