THE GENUS STEPHANOSPERMUM IN AMERICAN COAL BALLS

[1] Arnold C.A, 1947, INTRO PALEOBOTANY, P433

[2] BRONGNIART A, 1881, RECHERCHES GRAINES F

[3] Brongniart A, 1874, ANN SCI NAT BOT BIOL, V20, P234

[4] Florin R., 1936, SVENSK BOT TIDSKR, V30, P624

[5] Florin R., 1937, SVENSK BOT TIDSKR, V31, P305

[6] STUDIES IN THE TRIGONOCARPALES .2. TAXONOMIC PROBLEMS AND A REVISION OF THE GENUS PACHYTESTA [J]. AMERICAN MIDLAND NATURALIST, 1946, 36 (02) : 331 - 361

[7] KOSANKE RM, 1950, B STATE GEOLOGICAL S, V74

[8] Structure of seedlike fructifications found in coal balls from Harrisburg, Illinois - Contributions from the Hull Botanical Laboratory 431 [J]. BOTANICAL GAZETTE, 1932, 93 : 0151 - 0172

[9] Oliver F.W., 1904, T LINN SOC LOND, V6, P361

[10] SAHNI B, 1915, NEW PHYTOL, V14, P149

[1] Arnold C.A, 1947, INTRO PALEOBOTANY, P433

[2] BRONGNIART A, 1881, RECHERCHES GRAINES F

[3] Brongniart A, 1874, ANN SCI NAT BOT BIOL, V20, P234

[4] Florin R., 1936, SVENSK BOT TIDSKR, V30, P624

[5] Florin R., 1937, SVENSK BOT TIDSKR, V31, P305

[6] STUDIES IN THE TRIGONOCARPALES .2. TAXONOMIC PROBLEMS AND A REVISION OF THE GENUS PACHYTESTA [J]. AMERICAN MIDLAND NATURALIST, 1946, 36 (02) : 331 - 361

[7] KOSANKE RM, 1950, B STATE GEOLOGICAL S, V74

[8] Structure of seedlike fructifications found in coal balls from Harrisburg, Illinois - Contributions from the Hull Botanical Laboratory 431 [J]. BOTANICAL GAZETTE, 1932, 93 : 0151 - 0172

[9] Oliver F.W., 1904, T LINN SOC LOND, V6, P361

[10] SAHNI B, 1915, NEW PHYTOL, V14, P149