  We study the Higgs branch of the SCFT limit of 5d SO(6) and SO(8) gauge
theory with hypermultiplets in the spinor and vector representations. In the
case of SO(6) gauge theories, we contrast the magnetic quivers obtained with
those of SU(4) gauge theory with hypermultiplets in the fundamental and second
rank antisymmetric representations. Since SU(4) gauge theories admit several
different values of the Chern-Simons level, we make some observations about how
to distinguish those theories from the brane webs of the SO(6) theories. In the
case of SO(8) gauge theories, we use SO(8) triality to propose (naively)
inequivalent magnetic quivers, which will turn out to have the same moduli
spaces of vacua, at least locally around their most singular loci. We encounter
several interesting new phenomena occurring in the magnetic quivers, such as
hypermultiplets between neighbouring symplectic gauge nodes and matter in
two-index representations of unitary nodes. We also give a prescription for
computing the local Coulomb branch Hilbert series for quivers involving bad
USp(2) gauge nodes.
