The Eusporangiatae; the Comparative Morphology of the Ophioglossaceae And Marattiaceae
The book The Eusporangiatae; the Comparative Morphology of the Ophioglossaceae And Marattiaceae was written by author Campbell Douglas Houghton Here you can read free online of The Eusporangiatae; the Comparative Morphology of the Ophioglossaceae And Marattiaceae book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is The Eusporangiatae; the Comparative Morphology of the Ophioglossaceae And Marattiaceae a good or bad book?
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156. A-D. Four transverse sections of a young sporophyte of D.jenmani. X20. Section C shows stem apex. E. The apical meristem with apical cell of stem, x, and a leaf initial, /. Xi8o. F-I. Four sections from the same series, but taken lower down. X20. Figs. F, G, show fusion of double leaf trace with central stele, m, mucilage ducts. Between the mucilage ducts in G can be seen the small commissural strand. this point the section of the central stele forms a crescent of tissue, most of which has... not passed beyond the procambial stage. This crescent-shaped mass is evi- dently composed of two parts and represents mainly the basal undivided bundles of the two youngest leaves. Tracheary tissue has begun to develop in the older of these two masses. Occupying the space within this crescentic stele are three young mucilage canals, but none are yet developed in the cortical tissue of the stem. Within this central space there can also be seen the section of a small isolated group THE OLDER SPOROPHYTE 173 of procambial cells.
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