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Oliveira and Bhattacharya studied ribosomal RNA genes in the plastids of members of the red algae (Rhodophyta) to understand their phylogeny. Their analyses show that the more complex Florideophycidae form a monophyletic group, whereas the more simple Bangiophycidae are paraphyletic in origin. Furthermore, the plastids of the heterokont, cryptophyte, and haptophyte algae appear to have secondary, independent endosymbiotic origins from diifferent members of the Bangiophycidae. (see p. 482)

Branching in Archaeopteris

Meyer-Berthaud et al. shed new light on the lateral organs of Archaeopteris, a fossil plant that has long been of exceptional interest to botanists. Archaeopteris occupies a key phylogenetic position as sister group to the seed plants and plays an important role in several well-known hypotheses on seed plant origins. Based on new data from calcified tree trunks from Morocco, the authors show that the branching of Archaeopteris is more diverse and closer to that of seed plants than previously thought. (see p. 456)

Sex expression in the desert crust

Bowker et al. present data on a dioecious moss that is part of the soil crust of a high-elevation/middle-elevation site in the Mohave Desert. They found a highly female biased sex ratio and different microhabitats for males and females. A virtual absence of mature sporophytes suggests that in dioecious desert mosses sexual reproduction may be vestigial. (see p. 517)

Circumnutation and plant mobility

Larson ties together issues in plant biology—mcircumnutation of growing shoot tips, invasive species, and clonal growth—min a novel and interesting way. She demonstrates that the native honeysuckle Lonicera sempervirens has one consistent pattern of circumnutation in both erect and prostrate shoots, while the invasive exotic species L. japonica shows a reduced degree of circumnutation in prostrate shoots that allows for better rooting and rapid lateral expansion. (see p. 533)

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