The haustoria of Puccinia and host cell relations

The haustoria of 38 species of the rust fungus Puccinia were examined in re lation to the host cells. According to species, the haustoria were compared in size with parenchyma host cells, and host-pathogen area differences wer e found. Further observations were made of the pathogen host relations, spo re wall thickness, spore size, and growth of the fungus in the host tissue. Results concurred with taxonomic information as found in published literat ure.