Pallavicinia lyellii

Description

Thallus pale green, 3-8 cm x 4-5 mm, simple, innovations arise from the ventral side of midrib, margin entire, undulate; midrib with a central strand of narrow thick-walled cells; rhizoids brownish, arise from midrib, numerous; cells elongated; antheridia and archegonia not observed; capsule cylindrical, reddish-brown; spores 10-25 -m, reddish-brown, reticulate, elaters bispiraled.