Rogerson then attended Utah State University, where he had hoped to work under the supervision of botanist Bassett Maguire, but settled instead for the only available studentship with plant pathologist B.L.

He served as a technical sergeant in laboratory and pharmacy at an army evacuation hospital, and cared for internees released in the Philippines near the war's end.

During his war years, Rogerson made collections of plants, fungi, slime molds, and butterflies that he sent to Cornell or to the Smithsonian Institution.

Fitzpatrick committed suicide in 1950, and Donald S. Welch replaced him as Rogerson's advisor for the last few months of his doctoral program.

[1][2] In 1958, the director of The New York Botanical Garden, William Jacob Robbins, recruited Rogerson for the position of Curator of Cryptogamic Botany.

[1][2] During his tenure at the Garden, Rogerson was also a deeply involved member of the Mycological Society of America (MSA).

[2] Rogerson added many thousands of records of fungi, mainly from Utah, to the Garden herbarium, where his specimens are available for study by systematists.

"[1][2] In 1994 he started to issue an exsiccata, namely Fungi Boreali-Americani with Stanley Jay Smith and John H. Haines as co-editors.

[4][5] Clark T. Rogerson belongs to the Dudley mycological lineage, which can be traced back to Anton De Bary, a famous German mycologist.

William Russell Dudley was Assistant Professor of Cryptogamic Botany at Cornell University from 1883 to 1892, and received mycological training from De Bary in 1887.

Joseph Charles Arthur, George Francis Atkinson, and Mason B. Thomas studied under Dudley.