BY G. I. PLAYFAIR. 123 



Potts Hill (138); Pan-amatta Park (136), cum f. typica. 



Wille, /.(•., p. 27, T. xii., t'.4, ffives diineiisioiis 1 I x (I/;,; W. West, 

 for British spt^cimens, loiii;-. ll'l 1'2-r), lat. T-T'D/t; W. iV: (J. S. 

 West, WelwitselTs Afric Fi'w. Al,-., i«.l'3S, record Ki x Di-iO// for 

 African ones. The ratio of length to breadth, as shown In- these 

 records, agrees very well with that given above for Australian 

 specimens. The f. major figured by W. West, New Brit. Frw. 

 Alga^, PL ii., f.24, does not agree in outline with Wille's type, 

 hut belongs to O. Nmjelii. 

 Forma. 



Cellul* chloroplastidibus medio in transversuin divisis. 



Cell, matric. spher. x 20; autosp. 10x7/^. 



Parramatta Park (1 30), cmn f. tvpica. 



Var. MAXIMA W\ West. (Text-lig.l 2/>). 



"A^ar. cellulis 2-3-plo major (|uam forma typiea." W. West,/.r. 



Cell, matric. 34 x 30; autosp. 18 x 12//. 



Botany. 



(y. W. West, New Brit. Frw. Alg., p. 13, f.25, 1894, where he 

 gives long. 19-23, lat. 1 2-1;") /i as dimensions of the cells. W. it 

 G. S. West, AN'elwitsch's Afr. Alg., p. 238, record 33 x 23 for 

 African specimens. Dift'ers from the succeeding fcuiu onlv in its 

 undivided chloroplasts and larger size. 



Var. AUSTRALICA, n.var. (PI. vii., f. 13-17). 



Cellulie ellipticje vel ovales, plei-umque ad apices modice atten- 

 uat:e; chloroplastidibus singulis parietalibus lobatis, vel chloro- 

 plastidibus plus minusve distinctis 2-4, interdum 2:)yrenoides 

 singulos ferentibus. 



Cell, matric. diam. 30-40; autosp. vel cell. veg. 13 x 10, 14 x 11, 

 16 xll, 16 X 12, 20 X 14/7.. 



Parramatta Park (13()); Lismore, rivei", (273, 274); cum formal 

 typiea. 



Corresponds to var. Africana G. S. West, in O. Naydii. The 

 chloroplast is lobed or fragmented (the intermediate stage of 

 development between a simple lamina and parietal lozenges), or 

 sometimes there are 2-4 chloroplasts more or less distinctly visi- 



