Palinología de los géneros Tarasa y Wissadula (Malvaceae) de la República Argentina

CUADRADO G. A. Y A. R. MIÑO BOILINI,

Bonplandia

EUDENE

Lugar: Corrientes; Año: 2006 p. 167 - 187

0524-0476

Pollen grains of twenty two species of two genera of Malvaceae were studied and described under optical and scanning microscopy: Tarasa Phil.: T. alberti Phil., T. antofagastana (Phil.) Krapov, T. capitata (Cav.) D. M. Bates, T. heterophylla (Griseb.) Krapov., T. humilis (Gillies ex Hook & Arn.) Krapov., T. meyeri Krapov., T. odonellii Krapov., T. tarapacana (Phil.)Krapov., T. tenella (Cav.) Krapov., T. trisecta (Griseb.) Krapov. T. urbaniana (Ulbr.) Krapov. and Wissadula Medik: W. decora S. Moore, W densiflora R. E. Fr., W. excelsior (Cav.) C. Presl: W. glechomaefolia (A. St.-Hil.) R. E. Fr. W. gymnanthemum (Griseb.) K. Schum., W. paraguariensis Chodat, W. parviflora (A. St. Hil.) R. E. F., W. setifera Krapov., W. subpeltata (Kuntze) R. E. Fr.: W. tucumanensis R.E.Fr., W. wissadifolia (Griseb.) Krapov. They showed differences at generic level , except Tarasa alberti which has affinities with the Wissadula group. Pollen grains are spheroidal, oblate spheroidal and suboblate.Medium to big sized. The apertures show variations in number: (three to eigth) ,but all are colporate and have different distribution patterns:, zonocolporates, and spiralloid arrangement. The sculpture does not show marked differences on the surface; the most of them are echinate,echinulate with nanospinulae and perforations (foveas) between spines or spinulae.Two keys to determine the species of each genus are given.and three pollen grains types are recongnized based of the number and distribution pattern of apertures: 1) Tri-tetracolporate. 2) Pentazonacolporate y 3) Oligocolporate (6-8 apertures) spiraloid arragement. echinate,echinulate with nanospinulae and perforations (foveas) between spines or spinulae.Two keys to determine the species of each genus are given.and three pollen grains types are recongnized based of the number and distribution pattern of apertures: 1) Tri-tetracolporate. 2) Pentazonacolporate y 3) Oligocolporate (6-8 apertures) spiraloid arragement. echinate,echinulate with nanospinulae and perforations (foveas) between spines or spinulae.Two keys to determine the species of each genus are given.and three pollen grains types are recongnized based of the number and distribution pattern of apertures: 1) Tri-tetracolporate. 2) Pentazonacolporate y 3) Oligocolporate (6-8 apertures) spiraloid arragement.