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| THE REPRODUCTIVE DEVELOPMENT OF NEMALION HELMINTHOIDES(VALLEY)BATT.VAR.VERMICULAR (SUR.) TSENG AND THEIR LIFE HISTORY |
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| Plants are erect and cylindrical, purplish red in collour, lubricous in substance like noodles, over 10cm in height and 1.2-2 in width. The plant is of multiaxial type in anatomical structure, and monoecious. The spermatia and carpogonial branch usually are born on different branches of the same plant. The spermatia are formed at the terminal cells of the assimilating filaments. At first the primary cells produce 4-7 spermatial mother cells, each spermatial mother cell also produces 4 spermatia having a sphericity of 2-3μ diam. The carpogonial branch consists of 3-5 cells. The terminal cell of the carpogonial branch is a car-pogonium which ends in a long thichogyne. After fertilization the cairpogonium is divided by a transverse wall into two cells. The upper cell goes on dividing transversely or vertically into several initial primary gonimoblast cells, and the initial gonimoblast cells divide further into branches of gonimoblast filaments, with its terminal cells producing carpospores, but the gonimoblast filaments have no special investment called cystocarp. The life history of nemalion has a sporophyte stage, its tetraspores can immediately grow into an erect plant. |
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