BY G. T. PLAYFAIR. 513 



filaments of Sp. nitida, easily (listingiiishecl l)v their greater 

 l)i-eadth:— diam. cell. veg. 95-116, alt. 84-360; 3-5 ehloroplasts 

 making '!-?> turns, edges scalloped, a central ridge evident here 

 and there, large pyrenoids 6-10 to the half tuiii. (Lismore, 352, 

 353, 358). It is not unlikely that they really form one species. 

 Sj). FulJebonnl 8chm., Alg. aus Nyassasee, p. 76, T. iii., f.2 (fil. 

 diam. 40-42, zygo. 64-80 x 40//) seems to me a somewliat narrower 

 form of Sj). neglecta. 



Var. AMYLACEA, n.var. (PI. Iviii., f. 14-1 6). 



Oelluhe vegetativte chloroplastidibus amvlo suflusis, in granula 

 fractis; pyrenoidibus maximis, granulosis. 



Cell. veg. diam. 46 54, alt. 60-260: zygo. long. 74-90, lat. 48-50//.. 



Lismore (271). 



In this form, the chloroplasts have become impregnated with 

 amylum, and have broken up into minute irregulrir gi-ains. The 

 central ridge, however, is generally still noticeable, and the 

 pyrenoids are very large (up to 10-1 2/x), and gr^-nular as in 

 Closterium hinula. The whole of this gathering was of the same 

 character. The zygospores present were long-elliptic with 

 pointed ends, lying diagonally in short oblong cells which were 

 not inflated (as in PI. Iviii., f. 1). Probably, however, all the 

 various forms of zygospore detailed above for the type will be 

 found also in this variation. Chloroplasts 2-3, making 1| to 3| 

 turns in the cell. 



Genus Mougp]otia (Ag.) Wittr. 

 MouGEOTiA L^TEViRENS (A.Br.) Wittr. (Text-fig. 5). 



Cell. veg. diam. 27-44, alt. 255-408; zygo. long. 61-63, lat. 42-53//. 



Botanic Gardens, Sydney (158); Lismore (328, 332). 



Cf. Borge, Zygnemales, p.40, f.62. In our specimens, the 

 chloroplasts generally have a large number of p3^renoids, either 

 irregularly scattered or arranged in two lines at the edges. This 

 is the only species of Mougeotia, as fai- as I know, in which this 

 occurs. The pyrenoids are sometimes compai'ati\'ely small (2-4/x) 

 but occasionally very large, diam. 10//. The contents of the cyst 



39 



