Monographs Details: Duidaea
Authority: Carlquist, Sherwin. 1957. Anatomy of Guayana Mutisieae. Mem. New York Bot. Gard. 9 (3): 441-476.
Discussion:The distinctive genus Duidaea has pollen grains, in D. pinifolia, similar to
those of Gongylolepis. Grains of D. pinifolia (fig. 100 A-C) are sphaeroidal and
spinose, and have thick walls. Rods of the inner ektexine (fig. 100 C) are relatively
small. No features other than those found in Gongylolepis, however,
characterize D. pinifolia. The exine structure of D. tatei (fig. 101 A-C), therefore,
is surprising. Large lobe-like thickenings are found in intercolpar and polar areas.
These are distributed symmetrically, two on each intercolpar face and one on
each pole. In terms of the layers of the ektexine, this thickening is chiefly reflected
by a widening of the outer ektexine (fig. 101 C), although the inner ektexine
is also thicker in these areas. In addition to these prominent emergences,
numerous minute spines are present on the unthickened areas of the exine. Pollen
of D. tatei is further distinguished from that of D. pinifolia in that the shape of
the grains is basically subprolate.