MaskELL.—On the New Zealand Desmidier. 241 
give a laterally-grooved appearance to the segment and a minutely undulate 
appearance to the edge, while the central portion seems longitudinally 
costate. 
In side view each segment is angular-elliptic, the end somewhat truncate; 
and a broadly rounded inflation is distinctly visible at each side. 
End view elliptic. 
Length of frond 72 u; breadth in front view 50 p; breadth at inflation 
in side view 87 u; breadth at constriction 25 u. 
Not common: as yet only from the ditch at Bryndwr, near Fendalton, 
where T'riploceras tridentatum occurs, and very rarely in gatherings from 
Hawke's Day. 
I had long been puzzled by this plant, and had come to the notion that 
it might be a new species. Dut my English gatherings from Mr. Joshua 
have been useful here. One of them is labelled, ** C. speciosum var. biforme, 
Nordstedt,” and seems to contain scarcely any other Desmidies; and the 
European plant appears to correspond closely with ours. The differences 
are, that in the New Zealand plant the central inflation is quite distinet, 
especially in side view, and the ends are either round or only compressed 
very slightly, in front view. I rather think also that the granules are 
smaller than in the English form. 
I have met with no description of the European C. speciosum. Neither 
Ralfs, Rabenhorst, nor Pritchard mentions it; and the only reference 
which I have found in Professor Nordstedt’s papers is a statement that it 
occurs very sparingly in the Sandwich Islands. 
The term “ biforme” attached to my English specimens refers, I pre- 
sume, to the fact that some of them approach in outline rather to C. 
botrytis. 
C. cyclicum Lundell, var. ampliatum, var. nov. 
g. 7. 
Frond in front view orbicular, each segment being about twice as broad 
as long. Constriction linear, not deep, gaping. Segments when empty 
showing a number of minute semi-orbicular granules, arranged in rows 
radiating from the centre, so as to give a grooved appearance to the frond 
and an undulate appearance to the edge. The ends are not at all com- 
pressed. 
End view elliptic : the edge undulate. 
Diameter of frond in front view, either way, about 50 u: breadth at 
constriction 25 u. 
Rare: as yet only from a ditch on the Sumner Road, near Lyttelton, in 
company with Penium margaritaceum., 
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