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A text book of practical botany 1 by Dr. Ashok Kumar Dr. Ashok Bendre

By Dr. Ashok Kumar Dr. Ashok Bendre

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It is particularly common on moist soil, drying after the monsoon rains. P. E. Fritsch. The only Indian species is Fritschiella tuberosa. Algae Chlorophyceae Chaetophorales Coleochaetaceae Coleochaete Fig. 1. Coleochaete sp. Discoid thallus. Object Exercise 1 Study the thallus. Work procedure Prepare a slide by ftrst isolating a discoid or cushionoid epiphytic thallus from aquatic weed by scratching out the thallus with needle. Stain it with safranin, wash with water and -then mount in glycerine.

S. globule. Algae 2. 3. 4. The male reproductive organ is called a 'globule' while the female reproductive organ a 'nucule'. Both the sex organs are borne at one point on the nodes of short laterals which bear stipules. The characteristic feature of the genus Chara is the position of nuclei at the node above the globule. 4. Each shield cell is attached to a long handle or a rod-shaped cell-manubrium. 5. At the tip of each manubrium are two groups of six cells each. The group directly in contact with the manubrium is primary capitulum while the next is secondary capitulum.

7. Wall of the conceptacle is made of small and flat cells rich in chromatophores. 8. Numerous multicellular hairs arising from near the ostiole project outside. These are called periphyses. 9. Other types of multicellular hairs arising from the floor of the cavity are called paraphyses. 10. Some of paraphyses are branched and hold one or more antheridia at the tips of the branches. 11. Each antheridium has a thick wall made of two layers. 12. On maturity about 64 biflagellate antherozoids are produced.

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