1898 | REGENERATION AS EXHIBITED BY MOSSES 209 
F1G. 26. Portion of a defoliated stem showing the origin of protonemata 
and the formation of buds. X 130. 
Barbula muralis, 
FIG. 27. Basal portion of a leaf showing the origin of protonemata. X 130. 
FiG. 28. Portion of a leaf protonema showing a bud with rudimentary 
leaves. X 130. 
F1G. 29. Protonema with rhizoids which have been produced in light in a 
ten weeks old culture. X 130. 
PLATE XX, 
Atrichum undulatum. 
FIG. 30. Protonema grown from the leaf and showing the aggregated 
branching so common in the leaf protonemata of Atrichum. xX 130 
FiG. 31. Portion of a protonema with bud. X 130. 
FIG. 32. Cross section of a leaf showing the manner in which the proto- 
nemata originate from the cells at the base of the outer lamella. x 130. 
Polytrichum commune. 
Fig. 33. Diagram of a leaf which has produced protonemata and a leafy 
shoot. X 6. 
FiG. 34. Portion of a cross section of a 2 showing the origin of a pro- 
tonema from a cell at the base of a lamella. 220 
Fie. A bud produced direct by the ot cell of the main protonema 
axis, X 22 
Fic. oa A portion of a leaf protonema with aggregated branching. X 220. 
FIG. 37. Protonema grown from leaf in the dark. x 130. 
Fic. 38. Protonema grown from leaf in the light. X 130. 
FIG. 39. Portion of a protonema, and a bud grown from a leaf in the 
dark. x 220. 
Brachythecium rutabulum. 
FIG. 40. Cells from the leaf base, with bud and rhizo-protonema. X 220. 
Leptobryum pyriforme. 
Fig. 41. Cells of a rhizoid grown from a leaf in the dark. X 130. 
Fic. 42. Continuation of the same filament after exposure to light show- 
ing a direct change to protonema. X 130. 
F - Protonema grown from a leaf axil, showing the formation of 
conidia- like cells by the lateral branches. x 130. 
FiG. 44. Two of the separated protonema cells. X 220. 
FG. 45. Germination of two of these cells. X 130. 
