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Back Fibrous to parenchymatous dimorphic wood in Werckleocereus glaber. The plant produced hard fibrous wood while it was young (near the bottom of photo) and thus supported itself, but once it became older and leaned on some other support, it could then switch to making a weak, inexpensive parenchymatous wood (near the top of the photo). Secondary phloem is present in the top of the photo.
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