__________ are made up of sclerenchymatous cells. These are generally absent in the primary phloem but are found in the secondary phloem.
Phloem fibres
Phloem fibres are elongated sclerenchymatous cells with thick, lignified walls that provide mechanical support to phloem tissue. They are generally absent (or scarce) in primary phloem but are commonly present in secondary phloem, contributing to the bark. Commercial fibres like jute, flax and hemp are obtained from phloem fibres.
Xylem fibres/parenchyma belong to xylem, and phloem parenchyma is parenchymatous (not sclerenchymatous). Hence the answer is Phloem fibres.
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