Fossil Plants a Text book for Students of Botany And Geology volume 4
Fossil Plants a Text book for Students of Botany And Geology volume 4
A C Albert Charles Seward
The book Fossil Plants a Text book for Students of Botany And Geology volume 4 was written by author A C Albert Charles Seward Here you can read free online of Fossil Plants a Text book for Students of Botany And Geology volume 4 book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Fossil Plants a Text book for Students of Botany And Geology volume 4 a good or bad book?
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Dr Stopes 2 has recently re-described this species, adding a figure of the medullary-ray pitting. Annual rings well marked, often illustrat- ing the occurrence of compound rings of growth (fig. 716) which are discussed in detail in the original account ; bordered pits in a 1 Barber (98) Pis. Xxm. Xxiv. 2 Stopes (15) p. 169, text-fig. 50; also text-figs. 48, 49, and PI. Xv. 192 CONIFERALES [CH. single row, rarely double in the roots, free and circular in branches, often contiguous and compressed... in roots ; tangential pits common. Medullary rays usually uniseriate, 1 16 cells deep, pits confined to the radial walls, usually 1 but sometimes 2 4 oval and oblique pits in the field. Resin-canals absent; resin-parenchyma in vertical rows, abundant and scattered. The pith consists of pitted parenchymatous cells separated by intercellular spaces ; in the roots the rows of tracheids pass directly into the cells of the pith; in the branches they terminate in small groups of cells irregularb arranged.
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