| Exallosorus | Homoeostrichus | Zonaria |
---|---|---|---|
No. of cell layers | 4–6 | 2–4–7 | 4–12 |
No. of cortex / medulla in transverse section | 1 | 1 | 2 |
Sporangia | Sorus | Single, Sorus | Sorus |
No. of stalk cells | 1 | 1 or more | 0 |
No. of spores | 4 | 4 | 8 |
Indusium | + | - | + |
Paraphyses | + or - | + or - | + |
Color | Brown | Brown | White |
Structure | Spherical cells | Spherical cells | Elliptic cells in upper, spherical cells in middle and base |
Distribution | Australia and South Africa | Australia and Taiwan | widespread |
References | b, c | a, b, c, this study | a, b, c |