10b) Leaves entire, or toothed, or divided at tip into 2, 3, or 4 lobes. Figs. 214 to 224

   11a) Leaves flat or curved, not sharply folded. Figs. 214 to 219

   11b) Leaves two-lobed and folded, one lobe pressed firmly against the other. Figs. 220 to 224

   12a) Sporophyte borne In a perianth which is at the end of a dis tinct shoot. Figs. 2U to 217

   12b) Sporophyte borne from a small lateral or ventral bud; plants easily seen, often large; perianth 3 angled with one angle ven tral. Figs. 218 and 219

   13a) Plants brown or purplish, In dense tufts on very wet rocks. Leaves with a rounded notch and two rounded lobes, set transversely on the stem. Perianth shorter than the surrounding leaves and grown fast to them.
Family MARSUPELLACEAE

   Fig.214. Marsupella emarginata Dum.; a) fruiting plant; b) tip of plant with Involucral leaves; c) base of pedicel; dehiscing capsule.
   On wet rock or floating In water. Usually restricted to mountain streams.

   13b) Plants large (2 to 4 mm. wide) with leaves set very obliquely on the stem, succubous, with margins entire or sharply toothed.
Family PLAGIOCHILACEAE

   Fig.215. Plaglochila Interrupta Dum.; a) fruiting plant; b) leaves in detail.
   Occurs on moist banks and rotten logs.

   13c) Leaves entire, or broadly and shallowly notched at apex. Un- derleaves deeply divided into two long slender sharp lobes (entire in Harpanshis). Perianth sharply triangular, with one edge upper.
Family HARPANTHACEAE

   Fig.216. Chiloscyphus ascendens H.& W.; a) plant with sporophytes; b) leaves in detail and antheridium; c) Involucre; d) ripened capsule.
   Found on decaying logs.

   13d) Leaves entire or 2 or 3 lobed; under leaves entire or absent. Perianth oval or obovoid.
Family JUNGERMANNIACEAE

   Fig.217. a) Jungermannla barbata Sen.; b) Nardia crenulata Lin.

   14a) Leaves with two or more notches at apex (3 or more lobed); the upper margin of one leaf overlapping the lower margin of the above.
Family LEPIDOZIACEAE

   Fig.218. Lepidozia reptans Dum.
   Grows on soil and on rotten wood.

   14b) Leaves entire or two lobed. The upper margin of one leaf covered by the lower margin of the leaf above.
Family CEPHALOZIACEAE

   Fig.219. Cephalozla multiflora Spr.
   Grows on rotten wood and on the ground.

   15a) Upper lobe of leaf smaller than lower and only partly covering the lower.
Family SCAPANIACEAE

   Fig.220. Seapania undulata Dum. Leaves are reddish or purplish.

   15b) Upper lobe of leaf much larger than, and completely covering the lower. Figs. 221 to 224

   16a) Under lobe of leaf tongue-shaped, attached only at one end; under-leaf tongue-shaped, conspicuous. Large plants; 3 to 8 cm. long.
Family PORELLACEAE

   Fig.221. Porella platyphylla Lind.
   On rocks and trees in moist places.