  Micro-pattern gaseous detectors (MPGDs) are a promising readout technology
for hadronic calorimeters (HCAL) thanks to their good space resolution,
longevity and rate capability. We describe the development of a HCAL based on
MPGDs for an experiment at the proposed Muon Collider. The design of a
semi-digital MPGD-HCAL is shown and its performance is calculated with Monte
Carlo simulations with high-energy pions, showing an energy resolution down to
8\% for \SI{80}{\giga\eV} pions. We also present the performance of twelve MPGD
prototypes with different technologies (MicroMegas, $\mu$-RWELL and RPWELL)
assembled and operated in test beam first with high-energy muons and later with
pions in a hadronic calorimeter prototype of $\sim1\,\lambda_\text{I}$ length;
the detectors have a good response uniformity (lower than 17\%) and space
resolution and their performance in the calorimeter shows very good agreement
with the Monte Carlo shower calculation.
