Maskell. — On Nciv Zealand Desmidieae. 11 



Froud rather large ; constriction deep, linear ; segments in 

 front-view obscurely tliree-lobed, the basal lobes widely 

 emarginate with very shallow depressions ; end-lobe com- 

 pressed, ends slightly dilated, romid, a little protuberant, with 

 a deep narrow notch. At the base of each segment five 

 granuliferous inflations (three on the face and one at each 

 side) ; above these four others ; at the ends an inflation on 

 each side of the notch ; altogether eleven inflations on each 

 segment. The granules are conspicuous, and the cytioderm 

 is punctate. Segments in side-view thick, sub-cylindrical, 

 slightly narrowed near the ends, the inflations giving irregular 

 outlines. In end-view the sub-elliptical grooved ends appear 

 conspicuously on the rounded and inflated basal lobes, the 

 granules being conspicuous. 



Long., 75-80 fj.; lat., 40-44 ^; crass., 26 /j, ; lat. isthmi, 

 11-8 ^i.. 



Hawke's Bay ; Otaki. 



B. Forma minor, var. simplex, var. nov. Plate I., 



fig- 6- 



Frond much smaller than the last ; otherwise similar in 



•outline. Inflations not constant in number : some plants 



exhibit eleven on each segment, others only seven, the lowest 



row having only three, the middle only two ; inflations 



granuliferous, the granules distinct. Cytioderm smooth, or, 



at least, the puncta are extremely obscure. Zygospore 



globose, with subulate spines which have very broad bases and 



rather long points. 



Long., 53 /a; lat., 26 /a; diam. zyg. ex spin., 27 /x ; long, 

 spin., 11 IX. 



Eutherford's Swamp, Otaki. 



E. sinuosum was attached by Ealfs ("Brit. Uesm.," p. 85) 

 to E. circulare, Hassell, but has since been considered as 

 separate. The two forms here given do not, as it seems 

 (unless the hitherto undescribed zygospore of the European 

 plant be found to differ), require to be considered as anything 

 but varieties of the type. Nordstedt reports ("N.Z. Alg.," 

 p. 33) E. sinuosum from New Zealand without remark. The 

 measurements which he there gives (long., 87 jj. ; lat., 50 /x) are 

 & good deal larger than those of Ealfs. My var. gcmmuloszan 

 exactly corresponds with Ealfs's dimensions ; the var. simplex 

 is a good deal smaller. The measurements I give are constant 

 in a number of specimens observed. I think that the con- 

 spicuous granules in the inflations of both, the divided sub- 

 elliptical end conspicuous in end-view, and the shallowness of 

 the depressions in the edges, may be taken as sufficiently dis- 

 tinctive characters : the variable number of inflations is not 

 important. WoUe (" Desm. of U.S.," pi. xxvii.) figures 

 E. circulare with much-compressed end-lobe, and with a 



