Characteristics	P. ditristromatica	P. pavonicoides	P. boergesenii	P. fraseri	P. tristromatica	P. pavonica
Vegetative characters
Thallus
Shape	Flabelliform	Semicircular or circular	Flabelliform	Flabelliform	Flabelliform	Semicircular or circular
Calcification on lower/ upper surfaces	Moderate/heavy	No or light/light	Moderate/moderate	Light/heavy	No or light/light	No or light/light
Number of cell layers
Marginal portion (inrolled margin)	2 (2)	3 (2)	3 (2)	3 (2)	3 (2)	3 (2)
Middle portion	A mixture of 2 and 3	3	3	3	3	3
Basal portion	A mixture of 2 and 3	3	3	3	3	3?4
Other characters
Thickness of cell layers	Same thickness at 3-layer portion; and cells of upper layer twice as tall as those of lower layer at 2-layer portion	Same thickness from the margin to middle portion; central cell layer twice as tall as the surface layers at the basal portion	Cells of lower layer taller than those of upper layer; central cell layer shorter than the surface layers	Central cell layer tallest	Central cell layer shorter than the surface layers	Central cell layer tallest at 3 layer portion; same thickness at 4-layer portion
“Vaughaniella” stage	Absent	Absent	Present	Absent	Absent	Absent*
Hair lines
Arrangement of alternating hair lines between both surfaces	Unequal distance	Equal distance	Equal distance	Equal distance	?	Equal distance
Hair lines (lower/ upper surfaces)	Conspicuous/ conspicuous	Moderate/ inconspicuous	Conspicuous/ conspicuous	Conspicuous/ conspicuous	Conspicuous/ inconspicuous	Moderate/ inconspicuous
Structures (lower/ upper surfaces)	Broad-depressed/ narrow-undepressed	Broad-slightly depressed/narrow- undepressed	Narrow- undepressed/ narrow- undepressed	Narrow- undepressed/ narrow- undepressed	?/narrow	Narrow-undepressed/ narrow-undepressed
Reproductive characters
Reproductive system	Dioecious	Dioecious	Dioecious	Dioecious	Dioecious	Monoecious*
Sporangial sori
Position (surface)	Lower	Lower	Lower	Upper	Lower	Lower
Structure	Narrow	Narrow	Narrow	Broad	Narrow	Broad above hair lines, narrow below hair lines