NARDIA.—Plant of N. crenulata (a slender small leaved form), enlarged; portion of upper stem with leaves; perianth; calyptra; elater and spores.
JUNGERMANNIA.—§ 1. Plants of J. Schraderi, natural size and enlarged; two leaves; two underleaves; involucre; summit of perianth.—§ 2. Plant of J. barbata, enlarged; portion of stem with leaves and underleaves; perianth with involucre; involucre.—§ 3. Plant of J. Helleriana, enlarged; summit of stem with leaves, involucre, and perianth; involucral leaves, margin of perianth unfolded—§ 4. Plants of J. inflata, natural size and enlarged; cauline leaves; involucral leaf.
LUNULARIA.—Sterile and fruiting plants of L. vulgaris, enlarged; section of involucre, showing calyptra and capsule; lunate receptacle of sterile plant, with gemmæ.
MARSILIA.—Portion of plant of M. quadrifolia, a sporocarp; sporocarp burst in water and extruding the gelatinous ring with compartments attached.
