752 
ADDITIONS, CORRECTIONS, ETC. 
Page 22. Lejeunia. Perianth obovate, 3--6-plicate ; mouth a tubular beak. 
17. Teichocolea. Calyptra and involucral leaves combined ; leaves capillary, multifid. 
2. Fruit lateral. 
18/2. Mastigophora. Perianth ventricose, subcampanulate. 
21. Madotheca. Perianth contracted at the mouth, compressed, plicate. 
b. Lobule inflated-galeate. 
23. Frullania. Perianth 3-6-plicate or terete, with a tubular beak. 
19. Polyotus. Involucral leaves overlying each other, adnate below. 
B. Frondosse — Without distinct leaves, 
a. Perianth complete. 
24. Fossomeronia. Perianth on upper side of frond ; leaves angular. 
25. Noteroclada. Perianth near the apes ; leaves rounded. 
26. Petalophyllum. Perianth on upper side of frond ; frond continuous. 
27. Zoofsis. Perianth lateral ; frond continuous, with alternate lateral projections, 
tipped with cilia. 
28. Podohitrium. Perianth from the under side of a continuous frond. 
29. Steetzia. Perianth on upper side of a continuous frond. 
b. Perianth none. 
30. Symphyogyna. Calyptra on upper side of often stipitate frond ; nerve narrow. 
31. Metzgeria. Calyptra on under side of continuous frond ; nerve narrow. 
32. Sarcomitrium (Aneura). Calyptra lateral ; frond composed almost entirely of 
thickened nerve. 
C. Carnosse — Fronds fleshy, with oblique scales on under side. 
a. Fruits imbedded in substance of the frond. 
40. Riccia. 
b. Fruits terminal on the under side of frond. 
38. Targionia. Involucre 2-valved. 
c. Fruits many on the under side of a stalked peltate receptacle. 
33. Pl agio chasm a. Perianths opening laterally. 
34. Marchantia. Perianths opening downwards. 
35. Duhortiera. Perianth 0 ; involucres opening by a slit. 
36. Reboulia. Perianth 0 ; involucres opening by 2 valves. 
37- Fimbriaria. Perianth split into bauds cohering at their apices. 
D. Anthocerotse — Frond fleshy, without scales beneath. 
39. Anthoceros. 
Mr. Mitten has further favoured me with the following valuable remarks on 
the genera : — 
3. PLAGIOCHILA. Add after 16. 1\ deltoidea.— 
507. P. lseta, Mitten. Stem nearly simple, elongate, ascending, curved, with 
innovations below the perianth. Leaves patent, nearly orbicular, convex 
above ; dorsal margin recurved towards the apex ; ventral ciliate ; cells small, 
orbicular with narrow interstices. Perianth oblong-obovate ; mouth truncate, 
sparingly toothed. 
