| Height (cm) | Color | Surface | Hair lines | Sporangial sori | Holdfast | Cell layers | Indusium | References | |||
---|---|---|---|---|---|---|---|---|---|---|---|---|
 |  |  |  | Position | Arrangemant | Position | Arrangemant | Length (mm) | Breadth (mm) |  |  |  |
P. tetrastromatica | 8-16 | Greenish brown | Lightly calcified | On both surfaces | Alternate | On both surfaces | Successive | 7 | 4 | 4 | Absent | (Gaillard 1967) |
P. pavonica | 6 | Yellowish brown | Heavily calcified | On both surfaces | Alternate | On both surfaces | Alternate | 7-20 | 5-15 | 3-4 | Present | (Taylor, 1960) |
P. pavonicoides | - | - | - | On both surfaces | Alternate | Lower surface | Successive | - | - | 2-3 | Present | (Ni-Ni-Win et al. 2011 |
P. boryana | 7 | Yellowish brown | Moderately calcified on the lower surface and lightly calcified on the upper surface | upper surface | successive | Upper surface | Successive | 7 | 4 | 2 | Absent | (this study) |
P. ditristromatica | 5-10 | Yellowish or greenish | Heavily calcified | On both surfaces | Alternate | Lower surface | Successive | 7-10 | 5-7 | 2-3 | Present | (this study) |