Question

what has a central core of xylem with radiating arms to form a star shaped structure​

Answer 1

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This is the modification of the haplostele and somewhat more advanced in having the central xylem core with radiating ribs or arms (e.g., in Psilotum spp., Asteroxylon, Lycopodium serratum). Xylem is star shaped or stellate, hence the name. Phloem occurs as separate patches between arms of the xylem.

$\huge\fbox\red{hσpє}\huge\fbox\pink{ít}\fbox\green{hєlp}\huge\fbox\blue{yóû}$

$\huge\fbox{\red{\underline{mαrk \; mє \; вrαínlíєѕt \; plєαѕє ♥}}}$

$\large\bf{\underline\blue{❥thαnk \; чσu ♥♥}}$