Trakeider

Trakeider er langstrakte stavformede celler. Cellelængden er ca. 5-10 gange større hos nåletræ end hos løvtræ og mere primitive, oftest med tilspidsede el

Trakeider
En trakeide i eg

Trakeider er langstrakte stavformede celler. Cellelængden er ca. 5-10 gange større hos nåletræ end hos løvtræ og mere primitive, oftest med tilspidsede eller afrundede ender.

Nåletræ består af trakeider (over 90 %) og parenkymceller, mens løvtræ indeholder kar, taver, parenkym og trakeider. Trakeider i nåletræ er fx få hundrededele millimeter tykke og få millimeter lange.

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