Ornamentation Croton-pattern in the pollen grains of Brazilian Scrophulariaceae
DOI:
https://doi.org/10.24310/abm.v25i0.8474Keywords:
Scrophulariaceae, Croton-pattern, pollen grains, Agalinis, Esterhazya, Melasma, PhysocalyxAbstract
This study dealt with acetolysed pollen grains of some Brazilian species of the genera Agalinis, Esterhazya, Melasma and Physocalyx (Scrophulariaceae). They were studied, using light microscopy and SEM. The analyses showed that some species have pilate pollen grains, the pila being organized in a reticulum (retipilate) or in the known Croton-pattern that is common in the families Buxaceae, Euphorbiaceae and Thymelaeaceae. The pila of the species studied were notable for their reduced size, so that the ornamentation under light microscopy is seen as microreticulate, the pila (some multicapitate) being visible only under SEM. There are no reports of the Croton-pattern in species of Scrophulariaceae in the palynological literature.
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