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Diagonal And Tangential Vessel Aggregations In Wood: Function And Relationship To Vasecentric Tracheids, Sherwin Carlquist
Diagonal And Tangential Vessel Aggregations In Wood: Function And Relationship To Vasecentric Tracheids, Sherwin Carlquist
Aliso: A Journal of Systematic and Floristic Botany
The list of families with diagonal ("dendritic" or " flamelike" of other authors) patterns of vessel aggregation is similar to the list of families that have vasicentric tracheids. This paper attempts to deal with apparent exceptions. Because of recent reports of vasicentric tracheids, the families with diagonal vessel aggregations are all also on the list of families with vasicentric tracheids with the exception of four families. Genera of those four families are studied to see if a relationship between vasicentric tracheids and diagonal vessel aggregations does hold. Of the families not on both lists, Leitneriaceae (Leitneria), Melastomataceae ( …
Wood Anatomy Of Martniaceae And Pedaliaceae, Sherwin Carlquist
Wood Anatomy Of Martniaceae And Pedaliaceae, Sherwin Carlquist
Aliso: A Journal of Systematic and Floristic Botany
Quantitative and qualitative features are reported for one species of Martynia (Martyniaceae) and for seven species of six genera of Pedaliaceae. The inclusion of woody annuals as well as of shrubs provides a broader picture ofPedaliaceae than hitherto available. The wood features of Martyniaceae and Pedaliaceae (listed in the Systematic Conclusions) are compatible with placement of these families in Scrophulariales (Bignoniales). Ifindividual features of the two families are compared with those of other families of the order, however, no one family can be cited as more closely related to Martyniaceae and Pedaliaceae than any other. Martyniaceae is not necessarily the …
Wood Anatomy Of Placothira (Loasaceae), Sherwin Carlquist
Wood Anatomy Of Placothira (Loasaceae), Sherwin Carlquist
Aliso: A Journal of Systematic and Floristic Botany
Wood anatomy of the single species of Plakothira, a recently discovered genus from the Marquesas Islands, is described qualitatively and quantitatively. Features new for the family include presence of vasicentric scanty axial parenchyma and presence of perforated ray cells. Plakothira has several wood features specialized for Loasaceae: vasicentric axial parenchyma, extremely reduced borders on fibertracheids, and storying in fiber-tracheids. Wood of Plakothira is clearly loasaceous. Storying in fibertracheids is reported here for the loasaceous genera Fuertesia and Mentzelia. Wood anatomy of Plakothira represents paedomorphosis in great length of vessel elements, erectness of ray cells, lack of change in large primary …
Pliocene Nothofagus Wood From The Transantarctic Mountains, Sherwin Carlquist
Pliocene Nothofagus Wood From The Transantarctic Mountains, Sherwin Carlquist
Aliso: A Journal of Systematic and Floristic Botany
Subfossil wood fragments up to 10 cm long and 2 cm in diameter recovered from a locality thought on the basis of diatom deposits to be upper Pliocene-lower Pleistocene (Oliver Bluffs, Sirius Formation, 85°10'S., between 1800 and 1900 m in the Transantarctic Mountains) were sectioned for identification. Degradation prevented observation of some wood features, but others were well preserved. All of the fragments appear to represent one species. Features of growth rings (ring porous, vessels mostly solitary in earlywood), rays (predominantly uniseriate, both erect and procumbent cells common), vessel perforation plates (simple, at least in earlywood), lateral wall pitting of …
Wood Anatomy Of Nolanaceae, Sherwin Carlquist
Wood Anatomy Of Nolanaceae, Sherwin Carlquist
Aliso: A Journal of Systematic and Floristic Botany
Wood of seven collections of six species of Nolana, a genus (18 spp.) of the central western coast of South America was studied for quantitative and qualitative features. The wood is ring porous, with moderately wide vessels bearing simple perforation plates and alternate pits with some grooves interconnecting slitlike pit apertures. Imperforate tracheary elements are fiber-tracheids with vestigial borders on pits or libriform fibers; vasicentric tracheids (reported for Nolanaceae for the first time) are present in varying numbers. Axial parenchyma is vasicentric scanty (sometimes absent), sometimes with tangential bands that may be terminal in part. Rays are both multiseriate and …