TY - JOUR T1 - The shoot apex of Callistophyton poroxyloides JF - Contributions from the museum of paleontology, University of Michigan Y1 - 1956 A1 - Delevoryas, Theodore SP - 285 EP - 299 VL - 12 UR - http://deepblue.lib.umich.edu/bitstream/2027.42/48300/2/ID140.pdf IS - 15 ER -