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. 2010 Mar 31;277(1692):2257–2267. doi: 10.1098/rspb.2010.0224

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© 2010 The Royal Society

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Figure 2. — The parichnos system. Schematics showing aerenchyma system connecting buried and subaerial organs in Equisetum, Selaginella, the arborescent lycopsid Lepidodendron and Isoëtes. Note positional homology of the aerenchyma across the lycopsids. The phylogenetic relationships are shown by a schematic tree in which the branch lengths are not significant and many taxa are omitted for clarity. indicates approximate diameters of organs. Parts of the illustration are adapted from Britton & Brown (1913), Stewart (1947), Gifford & Foster (1987), Pigg (1992) and Stewart & Rothwell (1993). Note 1. At internode; rhizome is similar. 2. Rhizophore is shown, though the species of Selaginella pictured at the top is S. selaginoides, which lacks a rhizophore. Some species of Selaginella show aerenchyma developement in the rhizophore, but it is probably not homologous with the aerenchyma in the rooting organ of the arborescent lycopsids, Stigmaria (Karrfalt 1981). 3. With expanded paradermal section of the leaf base.

Inline graphic — The parichnos system. Schematics showing aerenchyma system connecting buried and subaerial organs in Equisetum, Selaginella, the arborescent lycopsid Lepidodendron and Isoëtes. Note positional homology of the aerenchyma across the lycopsids. The phylogenetic relationships are shown by a schematic tree in which the branch lengths are not significant and many taxa are omitted for clarity. indicates approximate diameters of organs. Parts of the illustration are adapted from Britton & Brown (1913), Stewart (1947), Gifford & Foster (1987), Pigg (1992) and Stewart & Rothwell (1993). Note 1. At internode; rhizome is similar. 2. Rhizophore is shown, though the species of Selaginella pictured at the top is S. selaginoides, which lacks a rhizophore. Some species of Selaginella show aerenchyma developement in the rhizophore, but it is probably not homologous with the aerenchyma in the rooting organ of the arborescent lycopsids, Stigmaria (Karrfalt 1981). 3. With expanded paradermal section of the leaf base.