Abstract
The uptake of water in gaseous or liquid phases through the epidermis of plant stems of the species Astrophytum myriostigma and Astrophytum ornatum was studied. The plants of this genus are known for the presence of trichomes, structures which are believed to play a role in water relations. The uptake of triated water by the plants having a surface with or without trichomes was compared. In the gaseous phase uptake was almost 10 times greater for surfaces with trichomes. In the liquid phase, uptake was greater in the absence of trichomes, which was probably related to the higher frequency of stomata on these surfaces. The efficiency of water uptake from the liquid phase was about one hundred times greater than that from the gaseous phase.
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