Homalomena - what's the name of these fibers?


Hello,
 
I cut a stem of Homalomena (probably rubescens).
The stem was about 2 cm in diameter.
These wood-like fibers are very hard to cut or tear.
I know that they help the stem to stay in horizontal position and to be elastic
I have never seen such a structure in any other aroid's stem.
In leaves of Monsteroideae (except Amydrium) similar fibers are named trichosclereids,
What is their name in the stem? (photo attached)
 
Best,
Marek
 

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