Taxonomy of Podostemaceae in Argentina

Origin, Structure, and Interpretation of the Thallus inHydrobryopsis sessilis(Podostemaceae)

“…Manuscript received November 2001;revised manuscript received April 2002revised manuscript received April . 1995Jä ger-Zü rn 1997;Rutishauser 1997;Tur 1997; Jä ger-Zü rn and Grubert 2000), or a combined shoot (leaf and stem) structure (Willis 1902b). We have used the neutral and descriptive term "thallus" without implying homology to liverworts (Vidyashankari and Mohan Ram 1987;Vidyashankari 1988aVidyashankari , 1988b; Mohan Sehgal 1992, 1997;Khosla and Mohan Ram 1993;Sehgal et al 1993;Khosla 1996;Uniyal and Mohan Ram 1996;Khosla et al 2000).…”

First record of fossil wood and phytolith assemblages of the Late Pleistocene in El Palmar National Park (Argentina)

“…5Y,Z) with cyperaceous affinity (Piperno, 1988); spherical spinulose morphotypes (Fig. 5U-X) characteristic of Arecaceae (Bertoldi de Pomar, 1975;Piperno, 1988;Zucol and Brea, 2000); irregular elongated morphotypes characteristic of the Podostemaceae (Tur, 1997); and unclassified morphotypes with angiospermous affinities. Other microremains of this assemblage correspond to sponge spicules (Fig.…”

“…The presence of Podostemaceae phytoliths, though scarce, is particularly important because they belong to a subfamily whose endemic species typically are found in the Paranaense province (Cabrera, 1976), north of this region, in river and waterfall areas (Upper Paraná, Iguazú, and Uruguay rivers and their tributaries) (Tur, 1997). These plants grow in dense populations in areas with full sun and in relatively shallow, quickly flowing rivers that have solid substrata (Tur, 1997).…”

“…These plants grow in dense populations in areas with full sun and in relatively shallow, quickly flowing rivers that have solid substrata (Tur, 1997). The scarce proportion of these phytoliths, similar to those of cyperoid morphotypes, strongly suggests their allochtonous origin.…”

Molecular and morphological variation in Terniopsis (Podostemaceae) show contrasting patterns

“…Thus, they are usually annual. In the early stage of their life cycle, when the rainy season starts, the seeds imbibe and germinate, and the seedlings grow into complex plants while submerged (Mohan Ram and Sehgal ). During seedling development, the root (rarely shoot) is adventitious from the hypocotyl (epicotyl) and produces a series of adventitious shoots (Imaichi et al 1999, Suzuki et al , Kita and Kato ).…”