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Xiao et al. describe new algal fossil populations from Doushantuo phosphorites at Weng'an, South China. These fossils represent material of the Late Neoproterozoic Era and are approximately 600 million years old. Revealing anatomical information at the cellular level, these phosphatized algal fossils include both simple pseudoparenchymatous thalli and more complex forms that bear reproductive structures similar to those of modern coralline red algae. (p. 214)

Lobeliads and light

Photosynthetic adaptations to sun and shade in the Hawaiian lobeliads are the subject of an important contribution by Givnish et al. Their paper represents the culmination of three years of field research and is the first paper to document=mfor a large group of closely related species=madaptive shifts in photosynthetic physiology and performance along an extensive light gradient, with important new implications for how such differences may restrict species distributions along that gradient. (p. 228)

A new sister for the Malpighiaceae

The highly specialized floral morphology of the Malpighiaceae (see front cover) has made the family difficult to place phylogenetically. New nucleotide sequence (ndhF, rbcL, PHYC) data presented here by Davis and Chase strongly support a sister-group relationship between Malpighiaceae and Elatinaceae. A previously described sister-group relationship between Malpighiaceae and Peridiscaceae is shown to have been based on a DNA sequence now known to be a chimera of at least two different species. Davis and Chase clarify the placement of three problematic angiosperm families in this study. (p. 262)

De novo variation

Schranz and Osborn offer important experimental work pertinent to evolution in polyploid plants. They examine variation in several quantitative traits among nine lines of polyploid Brassica napus that were synthesized de novo from diploid B. rapa and B. oleracea. Their study advances our understanding of factors governing success of polyploids in angiosperms. (p. 174)

This Article Submit a response Alert me when this article is cited Alert me when eLetters are posted Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Search for Related Content