Sietstobrs ir dzīva, prozenhimatiska (gara) šūna. Sietstobrus citu ar citu rindā savieno porainas sietplātnes. Šādas šūnu rindas aizvada organiskās vielas no lapām uz dažādiem auga orgāniem. Sietstobra (vienas šūnas) garums sasniedz 150 - 350 μm, bet diametrs - 20 - 30 μm. [1]
Atsauces
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