1 8 Trcmsac tions . — Bo tany . 



Christcliurch ; Hawke's Bay ; Otaki. 



A plant of the series of G. crenatum, Ealfs; but proportion- 

 ately shorter and broader, and the crenulations of the ends in 

 front-view are so obscure that the end often appears nearly 

 straight. C. nae(jclicuium, as figured by Wolle (" Desm. of 

 U.S."), is narrower than this New Zealand form, but his 

 description otherwise corresponds. This plant differs from G. 

 suh-xninctulatum, Nordstedt (" Alg. of N.Z.," p. 47), in the 

 absence of the granules which are conspicuous in that form. 

 The zygospore is new. 



Cosmariuvi turneriaimm, sp. nov. Plate III., fig. 28. 



Frond moderate ; segments in front-view twice as broad as- 

 long, or more ; constriction deep, linear, and somewhat wide, 

 so that the segments do not closely approximate ; segments 

 sometimes circular, sometimes trapezoidal, the edges deeply 

 sinuous with ten wide creiaulations ; cytioderm marked by a 

 number of granular inflations corresponding to the crenulations 

 of the edge, giving an appearance to the frond of grooves 

 radiating from the centre ; in the median space a series of 

 seven smaller inflations in a row on the base of each segment. 

 A frond with circular segments is almost regularly elliptical,, 

 the ends at the constriction somewhat sharp. In side-view, 

 segments sub-elliptical, narrow, ends rounded, edges very 

 obscurely crenulated towards the ends, and with a slight 

 inflation towards the base marked with minute inflations. In 

 end-view, frond sub-elliptical with sharp ends, tlie thickness 

 variable ; a slight median inflation visible, and the granules 

 arranged in transverse series. 



Long., 36-40 /x; lat., 40 /x ; crass., 14-20 /x. 



Hawke's Bay. 



This plant approaches G. cyclicum, Lundell, especially 

 when elliptical with rounded segments, but it is smaller, has 

 a wider sinus at the constriction, with more conspicuous 

 "grooves" on the frond, and the row of granules at the base 

 of each segment, producing the inflation in side-view, is quite 

 distinctive. Lundell gives two variant figures of G. cyclicum, 

 neither of which has trapezoidal segments. G. cyclicum, var. 

 arcticum, Nordstedt, is more angular than Lundell's type, but 

 its edges are irregularly incised, and it has not the rows of 

 granules which produce the inflations of our species. 



I have ventured to attach to this plant the name of Mr. 

 W. B. Turner, who has been kind enough to give me much 

 help. 



Gosmarium suh-cycUcum, sp. nov. Plate III., fig. 29. 



In 1882 ("Trans." vol. xv., p. 241) I reported this plant 

 under the name G. cyclicum var. ampliatum. Professor Nord- 

 stedt suggests to me that it should rather be a new species. 



