228 
Atkinson. — A Monograph of the 
Lemanea australis Atk. 
Fig. 19. Spore germinating and producing an element of the confervoid 
prostrate form. 
Fig. 20. Same producing b element of confervoid prostrate form and a young 
axis of Chantransia-i orm. 
Fig. 21. Farther advanced condition of development of the two forms of proto- 
nema from a spore. 
Fig. 22. Spore producing bb two axes of prostrate form, and d one axis of 
Chantransia- form ; cc, other axes of Chantransia- form developed, the main axis 
of which is producing a young sexual shoot of two cells growth at time of making 
the drawing, a, elements of the confervoid prostrate form developed both from 
the spore and from the basal cells of the Chantransia-ioxm. 
PLATE VIII. 
Lemanea australis Atk. 
Fig. 23. Mode of branching of main axis of Chantransia-form ; a, rhizoid. 
Fig. 24. Well-developed fertile Chantransia- form where the tuft was not 
crowded. 
Fig. 25. Branch of same farther developed. 
Fig. 26. Sterile Chantransia-ioxxa. 
Fig. 27. Portion of Chantransia- form showing arrangement of endochrome in 
mature and young cells. 
Fig. 28. Chantransia-ioxxo. producing a rhizoid a , from which is developed a 
fertile axis of Chantransia-ioxm b , bearing a young sexual shoot, c. 
Fig. 29. Portion of young sexual shoot showing fission of primary cells. 
Fig. 30. Cross section showing the first whorl of four cells differentiated from 
the central axis. 
Fig. 31. Longitudinal section of one half of young segment showing centrifugal 
development, a , central axis ; b, ray-cell ; c, generative filament. 
Fig. 32. Section of procarp-zone at time of anthesis showing ray-cells, b" b"'\ 
central axis, a ; enveloping filaments, c ; generative filaments, dd' ; procarp, e ; 
antheridia, g. 
Fig. 33. Section through young antherid-zone. 
Fig. 34. Farther development. 
Fig. 35. Section showing relation of generative filament to antheridiophores 
(the cylindrical cells which bear antheridia). 
Fig. 36. Section of antherid-zone at time of anthesis; c , antheridiophores; 
d , antheridia ; e, spermatozoid. 
Fig. 37. Section of procarp-zone, a, generative filament ; b, young procarp. 
Fig. 38. Same at time of fertilization, c, sterile filaments (paraphyses ?) pro- 
duced from the hypogynous-cells of the procarp ; d, trichogyne ; e, spermatozoids. 
Fig. 39. Same at time of differentiation of carpogenic cell at base of trichogyne. 
Fig. 40. Same in a later stage before the beginning of growth of the ooblastema- 
filaments. 
Fig. 41. Same later, showing development of spores from the ooblastema- 
