Mariya Yakovlevna Zerova, alternately Marija Jakovlevna Zerova, (April 7, 1902 – July 21, 1994) was a Ukrainian biologist and taxonomist known for her work in mycology. Her research included work on ectrotrophic mycorrhiza and fungal diseases of the rubber tree (Hevea brasiliensis) and beet (Beta sp). She made a major contribution to the multi-volume books of the Determination of Mushrooms of Ukraine published between 1967 and 1979. Her collection of 12,000 specimens of fungi and plants is now held in the National Herbarium of Ukraine. Education In 1917 she left the Mariinsky Women's Gymnasium with a silver medal and entered the Kiev Medical Institute. However, she contracted tuberculosis and left after studying for three years. She then attended Kiev University, studying in the Faculty of Biology within the (then) Institute of Public Education. She graduated in 1924. In 1942, Zerova defended a dissertation in mycology entitled Pleomorphism of some ascomycetes about the ontogenetic relationships of Ascomycota to the fungi imperfecti. In 1969 she was awarded a higher Doctor of Sciences degree for a thesis on the Study of the microflora of the USSR and mycorrhiza of the steppe part of Ukraine. Career After graduating, Zerova worked initially as a school teacher. However, she soon resumed a scientific career and spent her life studying fungal taxonomy, ecology and uses of fungi. After working at the Scientific Research Institute for Sugar Beet, in 1932 she was appointed head of the phytopathology department of the Scientific Research Institute of Rubber and Rubber Products. She studied the microflora and diseases of rubber plants and identified and described four new species of fungi: Macrosporium tausaghyzianum Zerova; Phyllosticta tausaghyziana Zerova; Myrothecium transchelianum Zerova & Tropova and Melanospora asclepiadis Zerova (a mycoparasite of Fusarium solani App. & Wr.). She moved to an Institute for Forest Plantations and researched plant pathology and also how mycology could improve the establishment of trees and shrubs in landscaped urban areas. She identified over 400 species of fungi, some new to science, on 160 plant species. In 1942 Zerova joined the MG Kholodny Institute of Botany of the USSR Academy of Sciences and remained there for the rest of her career. In 1963 she became head of the department of mycology, and from 1972 until her death in 1994 was a senior researcher-consultant. Research into mycorrhiza began at the Institute in the 1950s and her research moved into this area. She investigated