death_date birth_date image article_title name occupation
unknown 1877 file : mary katherine bryan.jpg mary k. bryan
 mary k. bryan botanist , phytopathologist
mary k. bryan

mary katherine bryan -lrb- february 13 , 1877 - ? -rrb-
was an american botanist and phytopathologist .
much of her research involved leaf spots and cankers caused by bacteria .
