Tribe V. ASPLENIEÆ. Sori more or less elongated, occupying one or both sides of oblique veins, covered by a special indusium which is attached by one side to the fertile vein, and is free on the other. Stipes not articulated.
9. Asplenium. Sori on the upper side or rarely on both sides of a veinlet. Veins free in all our species.
10. Scolopendrium. Sori linear, confluent in pairs, each pair appearing like a single sorus with a double indusium opening down the middle. Veins free.
11. Camptosorus. Sori oblong, variously curved, or some of them in opposite pairs. Veins reticulated.
Tribe VI. ASPIDIEÆ. Sori round or roundish, on the back or rarely at the apex of the vein, with a special indusium, rarely naked. Stipes not articulated to the rootstock.
[*] Indusium obsolete or none.
12. Phegopteris. Sori round, rather small. Veins free in our species.
[*][*] Indusium evident, round or roundish, covering the sporangia, at least when young. Sterile and fertile fronds not very unlike. Veins free in our species.
13. Aspidium. Indusium flat or slightly convex, orbicular or round-reniform, fixed by the centre, opening all round the margin.
14. Cystopteris. Indusium convex, fixed by a broad base partly under the sorus, commonly reflexed as the sporangia ripen.