Table 6. Inverse relationships among characters for variation within genera (potentially among species, among colonies, within colonies and residual). Summary from Table 4 with characters illustrated in Figure 2.

	Principal Component Axis	Within Genera Potential inverse relationships shown across columns for each PCA
	PCA-6	Dissepiment Width (DW)	Branch Width (BW)
		Aperture spacing Laterally	Node Diameter (ND)
		across Branch (ALB)
		Aperture Diameter (AD)	Node Spacing (NS)
	PCA-7	Node Spacing (NS)	Fenestrule Width (FW)
		Aperture spacing	Node Diameter (ND)
		Along Branch (AAB)
	PCA-8	Aperture spacing Laterally	Aperture spacing
		across Branch (ALB)	Along Branch (AAB)
		Node Diameter (ND)	Fenestrule Width (FW)
		Fenestrule Length (FL)	Aperture Diameter (AD)
	PCA-9	Fenestrule Length (FL)	Aperture spacing Laterally
		Aperture Diameter (AD)	Node Spacing (NS)
			Fenestrule Width (FW)