Blechnum L.
Coenosori in a continuous or almost continuous line on each side of the midrib covering the vascular commissures, having a membranous indusium opening inwards towards the costa. Veins of the sterile fronds free Blechnum
Fertile and sterile fronds dissimilar
Sterile fronds pinnate, pinnatisect or, if pinnatifid into numerous segments, then the segments not noticeably constricted at the base
Rhizome erect
Lamina flaccid, slightly paler beneath, glabrous. Main rhachis of the fertile fronds dull and mostly pale stramineous. Basal frond-segments reduced to auricles. Middle sterile frond-segments usually 1.2–4.5 cm long. Plants up to 60 cm high. Illawarra ranges. RF; in caves near waterfalls Blechnum chambersii
Lamina very rigid, usually much paler paler beneath, frequently glaucous or reddish, often clothed with chestnut-coloured scales when young, glabrous when old. Main rhachis of the fertile fronds glossy, black or atropurpureous. Basal frond-segments oblong or broadly oblong. Middle sterile frond-segments 3.5–11.5 cm long. Plants up to 60 cm high. Widespread. Common. RF; on the edges of creeks on Ss or basalt gullies or in peaty soil near swamps Blechnum nudum