Table 3 in Rediscovery of Angiopteris tonkinensis (Marattiaceae) after 100 years, and its revision

Table 3. Morphological comparison of Protomarattia tonkinensis and Archangiopteris tamdaoensis.
CharactersProtomarattia tonkinensis Hayata (BX19001 and AT1-2)Archangiopteris tamdaoensis Hayata (SG2765; Hayata 1919; He and Christenhusz 2013)Frond20-30 cm10-40 cmStipe30-40 cm40-45 cmRhizomeLong creepingLong creepingScales of stipeReddish-brown lanceolate scales, with teeth on the edge.Brown lanceolate scales, with teeth on the edge.Pulvinus of stipe11LaminaeOnce pinnate; pinnae 2 or 3 opposite or alternate pairs, elliptic. 25-28 cm × 5-6 cm.Once pinnate; pinnae 2-4 alternate pairs, elliptic. 20-25 cm × 4-5 cm.VeinsObviousObviousSoriSynangium; locules have numerous sori; 3-5 mm from margin, ca. 4-6 mm.Sporangia are independent of each other; medial between the costa and margin, 0.7-1 cm.ExosporesCoarsely echinateRod-like ornamentation