The Jepson Manual: Vascular Plants of California, Second Edition
... exudate, hairs, or scales; segments round, oblong, fan-shaped, or other, veins generally free. Sporangia: in sori or not, marginal,
submarginal, or along veins, covered by recurved, often modified segment margins (false indusia) or not; true indusia 0; spores
spheric, sides flat or not, scar with 3 ...