538 



NEW AND RARE FRESHWATER ALGM, 



Stat. Plon, vii., 1899, p. 20. A name that would take priority 

 of 8chroter"s is P. duodenarium (Bail.) Rabh., Fl. Eur. Alg., iii.. 

 p.71, 1864, but, from Raciborski's notes, it would appear to in- 

 clude several different forms, I.e., pp.9, 10. 



Forma ovata (Ehr.) Rac. (PI Ivii., f.31). 



CcEnob. (cell 4) diam. 53; cell, long.- 25, lat. 16/y-. 



Parramatta Park (136). 



Raciborski, Gatunki rodz. Pediastrum, 1 889, p 8. Syn., As- 

 terodiction ovatum Ehr., Ber. iib. d. Verb. d. Akad , 1845, p. 71: 

 P. ovatum (Ehr.) A.Br., Alg. unicell., 1855, p. 81; P. Sturmii 

 Reinsch, AlgenH. v. Frank , p. 90, T. vii., f.l; P. Schroteri Lemm., 

 Forsch. Biol. 8tat. Plon, vii., 1899, p. 20, T.2, f.33; /'. dathratum 

 f. ovatum (Ehr.) 8chm., in Eng. Bot. Jahrb., xxxii., 1902, p.84 

 T.3, f.l8. 



All forms of P. simplex are very rare here; I have them from 

 one spot only. 



Pediastrum duplex v. rkticulatuiM Lag. (Text-tig. 10). 



Coenob. (cell. 4) diam. 52; cell. long. 16, lat. 14/x. Ccenob. (cell, 

 permult.) long. 90-130, lat. 90-120: cell. long. 26-30, lat. 15-23/x. 



Sydne\' AVater-supply ( 80, 

 81, 90, 100, 115); Botany 

 (50). 



Lagerheim, Stockholms 

 Pedi., Protococc, o. Palm., 

 p.56, T. ii., f. 1. Syn., /'. 

 dnjylex v. clathratuin Schro- 

 ter, SchwebeH. uns. Seen, p. 

 37, f.86. This form is com- 

 mon enough in the Sydney 

 Water-supply, but rare else- 

 where here. In the large 

 coenobium figured, the two 

 dead cells on the left show 

 that the early stage of the 

 plant was more akin to P. 

 JJoryaituni. 



Text -fig. 1(1. 



Ptdia-strnm dt(p/e,v var. r(JicuJafii/ii 



Lagerh. ; ( x 500). 



