In-situ ice crystal scattering has been measured in cirrus cloud with the Small Ice Detector laser scattering probe. Using light scattered from single particles (maximum dimension ~<100 ¿m) at 4--10¿ and 20--40¿ we have tested ice crystal scattering phase functions for spheres, hexagonal columns, hexagonal plates, polycrystals an aggregate of columns and an analytic function. We find that phase functions that lack a pronounced 22¿ halo are the best representatives for the example data presented here. Spherical ice particle phase functions do not satisfy the measurements.