Exine Development, Structure, and Resistance in Pollen of Cinnamomum (Lauraceae)

Modern pollen and its ecological relationships with the tropical deciduous forests of central Uttar Pradesh, India

“…As the dominant taxon in the wetland, the destruction of Cyperaceae causes a decrease in total pollen concentration. The fragility and poor pollen preservation of Lauraceae (growing in the area of investigation) in surface samples, and its breakdown under acetolysis, accounts for its lack of representation (Walker 1976;Van der et al 1990;Rowley & Vasanthy 1993). The structure and ornamental differences of exines can affect pollen preservation in our study area.…”

Pollen Diversity in Some Modern Magnoliids

“…These have been interpreted as ectexinous by some, e.g., Rohwer (1993). Stone (1987) considered them to be endexine, because of their lack of UV fluorescence with Auramine O, in contrast to the ectexinous spinules, and this view was supported by Rowley and Vasanthy (1993). Thin discontinuous straplike filaments can occur outside the globules in some Lauraceae, and Rowley and Vasanthy (1993) interpreted them as ectexine.…”

Pollen morphology and ultrastructure of Australian Monimiaceae ‐Austromatthaea, Hedycarya, Kibara, Leviera, StegantheraandTetrasynandra

“…There are parallels in exine structure between many members of the Lauraceae and those Monimiaceae with a more reduced exine. Steganthera and Tetrasynandra resemble pollen of Aiouea, Cinnamomum, Endlicheria, Licaria, Ocotea, Persea, Phoebe, Pleurothyriu Nectandra and Umbellularia of the Lauraceae in having a very reduced exine with globules between and at the bases of the spinules, gemmae or verrucae (Kubitzki 1981, Hesse & Kubitzki 1983, Raj and Werff 1988, Rowley & Vasanthy 1993. However these globules are more prominent and numerous in these members of the Lauraceae than in Steganthera and even less abundant in Tetrasynandra.…”

“…In addition, these members of the Lauraceae have a welldeveloped outer intine containing radially aligned channels. This "exintine" (Stone 1987) which Rowley & Vasanthy (1993) term an "onciform zone" is absent from Steganthera and Tetrasynandra, with the result that they have an even more reduced sporoderm. A well-developed channelled outer intine, is, nevertheless present in Palmeria and Peumus of the Monimiaceae sensu stricto and in Hortonia of the related Hortoniaceae, but in all these examples the channels are basically tangentially aligned, rather than radially aligned, and the zone is not as thick as the outer intine (onciform zone) of the above cited members of the Lauraceae (Foreman & Sampson 1987, Sampson & Foreman 1990, Sampson 1993.…”