10 Transaction s . — Botany . 



sidered as a separate species. Hereafter it may be perhaps 

 taken only as a large form of S. puhhelluni. 



Genus Onyclionema, Wallich. 



■■'■ Onyclionema fiiiforme, Elirenb. 



I reported this plant in 1880 under the genus S2)h(Brozosma. 

 Messrs. Eoy and Bisset ("Japan Desm.," p. 242) draw atten- 

 tion to the fact that the double processes vverlap the semi- 

 cells, and that the plant must therefore be placed under 

 Onyclionema. 



Hawke's Bay ; Christchurch ; Otaki. 



Genus Euastrum, Ehrenberg. 



Euastrum mamviaium, sp. nov. 



A. Forma onajor, var. siih-cnneatuvi. Plate L, fig. 4. 

 Frond rather large ; constriction deep, somewhat widened 



internally ; segments in front-view cuneate, margins nearly 

 straight, but with a low inflation or mamma about half-way 

 to the end; ends slightly protruding, and at each side of the 

 notch emarginate ; the notch is shallow, but seems as if con- 

 tinued in a shallow groove for nearly a quarter of the distance 

 to the isthmus. On the surface of the frond several (seven or 

 eight) very inconspicuous inflations in two transverse series, 

 two of which correspond to the lateral mammae ; at the ends 

 an inflation at each side of the notch. Cytioderm punctate. 

 In side-view, segments tapering from a shallow constriction to 

 narrow rounded ends ; median mammae and inflations visible. 



Long., 70-77 p. ; hit., 35-42 /x, ; crass., 18-24 /x ; lat. isthmi, 

 llytt. 



Hawke's Bay. 



B. Forma minor, var. cllvpticum. Plate I., fig. 4(7. 

 Frond smaller and somewhat less angular than the last ; 



the sides slightly convex, the ends much more protuberant than 

 in suh-cuneatum. Lateral mammaj, inflations, and groove as 

 in the larger form. The puncta are less distinct. Ends in 

 side-view very slightly dilated. 



Long., 60-67 /x; lat., 31-35 /y.; crass., 20-22 /x; lat. isthmi, 



Kutherford's Swamp, Otaki. 



Both forms of tbis plant approach E. cuneatum, Jenner 

 (which also occurs in New Zealand) ; but they are much 

 smaller, and the inflations, the grooves at the notch, and the 

 protuberant ends distinguish them. 



Euastmm sinuosum, Lenormant. 



I have two forms which I refer to this species, as follow : — 

 A. Forma major, var. gemmulos^im, var. nov. Plate I., 

 fig. 5. 



