Laing. — On New Zealand Species of Ceramiacese. 395 



the stem and main branches are not provided with pinnules, 

 the tips of stem and branches are thus rather plumose. The 

 cells of the pinnules are from 150-180 /x long and about 30-40 /x 

 broad. The cells of the cortex vary much in their dimension, and 

 are from two to four times as long as broad. I have seen no 

 reproductive organs on this plant. 



2. Callithamnion colensoi, Harv., Fl. N.Z., ii., 259. Plate 

 XXVIIL, figs, la, lb. 



Frond dark-purple, robust, dendroid, 2-3 in. high. Main 

 stem as thick as a sparrow's quill below, internodes coated 

 with small cells, laterally branched ; branches densely clothed 

 all round with minute compound squarrose imbricated ramuli ; 

 ultimately divaricate, subulate-acute, alternate ; articulations 

 coated with small cells, one and a half times longer than broad, 

 ultimate pellucid. 



Distribution. — East Coast and Hawke's Bay (Colenso). 



I have a fragment of a plant on a microscope-slide which 

 probably belongs to this species. It was collected at the Nuggets. 

 Unfortunately, I do not seem to have any mounted specimens of 

 it. The rachis and pinna 1 are alternately branched, lanceolate 

 in outline, and each of the younger pinna? is developed inside 

 a membrane, from which it finally escapes. This is evidently 

 a highly characteristic feature of the plant. The ramuli are 

 compound, and from 80-100 /x in length. The cells composing 

 them are minute and approximately square, with a length of 

 15-25 /x. The tetraspores are arranged along the pinnules in 

 some cases in two, three, or four longitudinal rows, but in 

 other cases no orderly arrangement can be made out. They 

 are developed in the axils of the ramuli, which clothe the 

 whole plant in the manner described above, i.e., " with minute 

 compound squarrose imbricate branchlets." The ramuli bear 

 divaricating processes, which are sometimes secund, and at 

 other times irregularly alternate and dichotomous. The plant 

 is completely corticated with small cells. Articulations of the 

 ultimate pinnules are about twice as long as broad. 



3. Callithamnion consanguineum, Harv., Fl. N.Z., ii., 295. 



Fronds densely tufted, flaccid, rose-purple, 2-3 in. high, 

 capillary, excessively branched ; branches spreading, the smaller 

 distichous above, alternately clecompoundly pinnate and alter- 

 nately plumulate ; plumules short, flabellate, naked below, pin- 

 nate above, terminal ; pinna 3 close-set ; articulations opaque, 

 with cortical cells two to three times as long as broad ; upper 

 pellucid. Tetraspores lateral, subsolitary, triangularly divided. 



