690 Leivis . — The Life History of Griff thsia Bornetiana. 
PLATE LIII (Figs. 129-58). 
Fig. 129. Partitions about one-third of the way to centre of tetrasporangium. x 850. 
Fig. 130. Later stage, partitions double, chromatophores visible around periphery, x 850. 
Fig. 131. Partitions almost reach to centre of tetrasporangium; spores nearly separated. 
X 850. 
Fig. 132. Spores completely separated, still enclosed by gelatinized wall of tetrasporangium. 
X 33 °* 
Fig. 133. Diagrammatic longitudinal section showing mode of occurrence of tetrasporic 
structures. X 30. 
Figs. 134-8. Tetraspore-like structures from male plant, x 850. 
Fig. 134. Basal cell with two tetraspore-mother-cells (cf. Fig. 108). 
Fig. 135. Later stage, only one tetraspore-mother-cell present. 
Fig. 136. Basal cell with tubular outgrowth (cf. Fig. no). 
Fig. 137. Tetraspore-mother-cell showing eight nuclei ; cleavage of cytoplasm has begun. 
Fig. 138. Sixteen nuclei present in mother-cell, no trace of cleavage. 
Fig- 139. Vegetative cell accidentally isolated has produced a rhizoid from basal end. x 100. 
Fig. 140. Later stage showing young plant developed from similar isolated cell, x 15. 
Fig. 1 41. Binucleate sporeling. x 850. 
Fig. 142. Eight-nucleate sporeling, optical section. X 500. 
Fig. 143. Section of sixteen-nucleate sporeling. x 850. 
Fig. 144. Sporeling has begun to elongate without division. X 500. 
Fig. 145. Two-celled sporeling. x 850. 
Fig. 146. Three-celled sporeling. x 850. 
Fig. 147. Same, surface view, x 30. 
Fig. 148. Three-celled sporeling after elongation, attached to filament of Lo?nentaria. x 100. 
Fig. 149. Similar stage, showing difference in relative size of the cells, x 100. 
Fig. 150. Sporeling of same age growing on glass ; basal cell very long. X 100. 
Fig. 1 5 1. Similar sporeling after basal cell has reached a suitable substratum, x 100. 
Fig. 152. Section showing basal cell of sporeling applied to surface of Champia. x 100. 
Fig- 153. Section showing basal cell penetrating tissues of Champia. x 100. 
Figs. 154-6. Development of attaching disk from basal cell, x 30. 
Fig* 157 . Four-celled sporeling ; basal cell branched, x 30. 
Fig. 158. Sporeling beginning to branch, x 30. 
