28 Transactions. — Botany. 



Feniumpohjmorphum, Verty, forma. Plate Y., fig. 51. 



The senu-cells are more cylindrical than in the type, as 

 figured by Lundell (" Desm. Suec," pi. v., 10), and the ends 

 less attenuated. The striae are so faint that it is very difficult 

 to make them out. The cytioderm is pale pink or straw- 

 coloured. 



Long., 43 ix; lat., 20 ju.. 



Christchurch ; Hawke's Bay ; Otaki. 



My measurements, Avhich are much smaller than those of 

 Professor Nordstedt, agree exactly with those of Lundell. 



Pemum navicnla, Brebisson. Plate V., fig. 51a. 



Long., 55-60 /x; lat., 12-15 /x; diam. zyg., 20-25 /x ; diam, 

 zyg. diagonal, 45 ju,. 



Eutherford"s Swamp, Otaki. 



This plant ought perhaps to be considered as a small form 

 of P. closterioide, Ealfs, but Wolle and others separate it. I 

 cannot detect any "dancing" granules at the ends, as the 

 characteristic ones of P. closterioide. 1 give a_ figure of the 

 zygospore (of winch I have observed two specimens), which 

 Wolle ("Desm. of U.S.," p. 36) describes without figuring. 

 A figure of it is given in Lundell (" Desm. Suec," pi. v., 8), 

 and the dimensions of that are not far removed from ours; 

 but the angles appear to be somewhat sharper, and the empty 

 conjugathig cells proportionately smaller than those of the 

 specimens which I have seen. 



Peninm incrassaium, sp. nov.(?). Plate V., fig. 52. 



Frond sub -elliptical, somewhat dilated at the middle, the 

 ends broadly rounded ; there is no constriction, but the cell- 

 wall appears slightly thickened outwardly at the centre, so 

 that in soine specimens there is the appearance of a thin ring 

 round the plant. Cytioderm very obscurely punctate. 



There are two sizes — Forma major, long. 60 ^, lat. 88 fx ; 

 Forma minor, long. 40 /x, lat. 25 /x. 



Hawke's Bay. 



On account of the thickening of the cell-wall in this plant 

 I hesitate as to its position. It seems to be properly attached 

 to the genus Peniuni by the arrangement of the endochrome 

 in fillets, and if there were any sign of a median constriction 

 I should look upon it as perhaps allied to P. iagenaroide, 

 Bisset (" Desm. Winderm."). The name given above is applied 

 to it here provisionally. 



Genus Docidium, Brebisson. 

 "-^= Docidium nodosum, Bailey. Plate Y., fig. 53. 

 Long., 250 /x; lat. max. nod., 41-5 /x. 

 Eutherford's Swamp, Otaki. 



