By Dr. Ashok Kumar Dr. Ashok Bendre
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Airborne dirt and dust jacket notes: "In Morphology and Evolution of Vascular crops you will discover up to date discussions of category and sexuality in ferns; of the body structure of the unusual African desolate tract plant Welwitschia mirabilis; and of fossil plants from the reduce and Mid-Cretaceous eras. As helpful and fascinating to the introductory botany or plant morphology scholar as to the reader, the 3rd variation of this vintage textual content bargains thoroughly present descriptions of the mature constitution, organ improvement, replica, fossil list, phylogenetic tendencies, and interrelationships of each significant vascular plant team.
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Additional info for A text book of practical botany 1
1) Plant body multicellular, (2) Thallus parenchymatous, (3) Presence of spermocarp. intercalary cell #' • I I I I I ! g. ) or on other algae. It also grows endophytically inside the cells of Charales. ,'li1III_- holdfast Fig. 1. Oedogonium. A filament. IOedogonium I Classification Sub-division Class Order Family Genus caps Algae Chlorophyceae Oedogoniales Oedogoniaceae Oedogonium ~~-- receptive spot nucleus Exercise 1 cytoplasm Object : Study of thallus. :"----pyrenoid Stain a few filaments in safranin, wash with water and mount in glycerine.
6. The cytoplasm of a rhizoidal cell has a nucleus situated towards the upper side of the cell. 7. At the septum of a rhizoidal cell, the ends are protracted in opposite directions to form knotted part. 8. At this place, signifying a node, a plate of four cells or even more is formed which gives rise to rhizoidal branches. This part is known as rhizoidal plate. 9. Main axis is composed of long internodes alternating with small nodes. 10. Long internode is composed of a single cell enveloped by many corticating threads.
PHAEOPHYCEAE The phaeophyceae or brown algae are distinctly marine, inhabiting littoral regions of Arctic and Antarctic seas. Marine brown algae form a clear vertical zonation on the rocks in the sea. These algae are always multicellular and microscopic or macroscopic. A few members show external differentiation of the thallus into holdfast, stem-like axis and leaf-like blades. Internal differentiation, including tissue differentiation into sieve tube-like structures is also found. Reproduction involves vegetative reproduction by fragmentation.