Species

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Total: 95

species valid

Sporites michiganensis C.A. Arnold Contr. Mus. Paleontol. Univ. Michigan, 8(5): 91. 2 Jun 1950

species valid

Sphenopteris bradfordii C.A. Arnold Contr. Mus. Paleontol. Univ. Michigan, 7(9): 204. 29 Dec 1949

species valid

Spermatites reticulatus C.A. Arnold Bull. Torrey Bot. Club, 75(2): 142. 10 Mar 1948

species valid

Spermatites globosus C.A. Arnold Bull. Torrey Bot. Club, 75(2): 144. 10 Mar 1948

species valid

Spermatites cylix C.A. Arnold Bull. Torrey Bot. Club, 75(2): 144. 10 Mar 1948

species valid

Samaropsis hesperia C.A. Arnold Contr. Mus. Paleontol. Univ. Michigan, 6(4): 64. 1 Oct 1941

species valid

Rotodontiospermum illinoense C.A. Arnold, Steidtmann Amer. J. Bot., 24(9): 647, 649. 15 Nov 1937

species valid

Rhus diluvialis C.A. Arnold Contr. Mus. Paleontol. Univ. Michigan, 5(8): 93. 30 Oct 1937

species valid

Reimannia aldenensis C.A. Arnold Bull. Buffalo Soc. Nat. Sci., 17(1): 5. 1935

species valid

Pyrus mackenziei C.A. Arnold Contr. Mus. Paleontol. Univ. Michigan, 5(8): 93. 30 Oct 1937

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