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Trends of specialization in pollen of flacourtiaceae with comparative observations of cochlospermaceae and bixaceae


, : Trends of specialization in pollen of flacourtiaceae with comparative observations of cochlospermaceae and bixaceae. Grana 15(1-3): 29-50

Pollen from 17 genera [Erythrospermum, Streptothamnus, Berberidopsis, Carpotrochi, Mayna, Caloncoba, Lindackeria, Buchnerodendron, Mocquerysia, Azara, Itoa, Cesearia, Samyda, Bixa, Hydnocarpus, Ahernia and Rawsonia] of Flacourtiaceae was examined by (scanning electron microscope) and (transmission electron microscope) TEM; 12 of them represented the primitive tribes Berberidopsideae and Oncobeae. Small, minutely structured grains are widespread in this family, and are often lumped together as 1 morphological type. A study of the relative thickness of the tectal layers, and of the arrangement and size of columellae and perforations, indicates that not all minutely structured grains are homologous in development. Most genera of Berberidopsideae and Oncobeae can be termed microperforate tectate, as the muri are X2-5 as wide as the lumina and both features are less than 1 .mu.m in diameter. Berberidopsis pollen is unique in the Flacourtiaceae in being tricolpate and in having a rough, thick tectum infrequently traversed by microperforations 0.03 .mu. in diameter. Tendencies toward perreticulate structure occur in Mocquerysia. Development of a high infratectal space is illustrated by Casearia nitida and an intectate exine in the related Samyda dodecandra. Pollen of Cochlospermum and Bixa are distinct from Flacourtiaceae and show independent trends of specialization.

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