Number of nuclei per spore. The number of nuclei in juvenile and mature spores plotted against spore diameter of G. diaphanum (y = -162.53 (P = 0.00) + 5.76x (P = 0.00), R2 = 0.57). The diameter of spores plotted against the number of nuclei per spore. A, G. irregulare (n = 113); B, G. aggregatum (n = 105) and C, G. cerebriforme (n = 60). G. cerebriforme spores had the smallest number of nuclei per spore and were also the smallest in size, while G. diaphanum spores had the largest number of nuclei per spore. There is a positive linear relation between the number of nuclei per spore and spore diameter: G. irregulare (y = -81.09 + 3.91x, R2 = 0.3583), G. aggregatum (y = -45.69 + 2.65x, R2 = 0.5252) and G. cerebriforme (y = -21.35 + 1.66x, R2 = 0.3425). All slopes were statistically significant at p < 0.05.
Marleau et al. BMC Evolutionary Biology 2011 11:51 doi:10.1186/1471-2148-11-51