Which type of spores of Puccinia graminis tritici infect the barberry plant

Basidiospores type of spores of Puccinia graminis tritici infects the barberry plant.
Graminis tritici, the fungus causing stem rust of wheat, the haploid basidiospores can infect barberry but not wheat, and the haploid mycelium can grow only in barberry.
There the fungus produces structures called pycnia, and sexual reproduction occurs with cross-fertilization between two different mating types of pycnia. Then the fertilized fungus grows down through the barberry leaf.