BY G. I. PLAYFAIK. 145 



The membrane is often somewhat incrassate at the poles, and 

 occasionally, but very rarely, a slight papilla is present. Axial 

 ratio varies from 1'05 to 1'23: 1-00, the average of twelve records 

 being M to 1-0. 



Var. ovALis, n.var. (PI. ix., f.7, 8). 



Cellulse late-ovales; apicibus late-rotundatis nee acuminatis; 

 membrana interdum utroque polo introrsum incrassata. Chloro- 

 plastides ut in forma typica. 



Cell. veg. 54x48,80x66, 80x70, 80x74, 84x70,84x74, 

 85x75, 90x82, 92x82, 94x88, 96x86, 98x86, 98x88, 

 100x86, 100x88, 104x94, 110x93, 110x100, 110x104, 

 120 X 110/M. Membr. crass. 1^-6/x. 



Coogee(58, 93); Auburn (67, 119, 140, 148, 149, 164); Rook- 

 wood (107); Canley Vale (128); Potts Hill (138); Guildford(146). 



Almost as common here as the type, in company with which 

 it is generally found. The apices in this form are rounded off, 

 not acuminate as in var. acuminata. Occasionally, they are 

 flattened somewhat, showing a tendency to pass over into var. 

 doliformis. The inner mucous layer of the membrane, when 

 present, is nearly always longitudinally corrugate. The ratio of 

 the axes varies from about Tl to 1*2: TO, the average of the 

 twenty specimens given above being l*12:r00. Quite plentiful 

 in some gatherings, e.g., Nos.67 and 107. 



Var. DOLIFORMIS, n.var. (PI. ix., f.9, 10). 



Cellulse liberse oblongse, doliformes; lateribus plus minusve 

 arcuatis; apicibus truncatis interdum papilla instructis; angulis 

 obtuse-rotundatis. Cellulas matrices non vidi. 



Cell. veg. 86x72, 88x70; 114 x 100 ap. 30; 120x 97 ap. 30; 

 120 X 105, 142 X 118/x. 



Auburn (118, 140, 174); Fairfield (79); Canley Vale (128); 

 Lismore (240). 



Rarer than the preceding forms, it nevertheless generally 

 turns up in any habitat where the type is found. Chloroplasts 

 are of the usual irregular lozenge-shape. Sometimes thei'e is a 

 slight apical incrassation on the inner side of the membrane, 

 and, more rarely, a tubercle outside. 



a 



