ON NAIAS GRAMINEA DEL, VAR. DELILEI MAGNUS. 821 
This divergence of form in the pollen-grain of Naias major 
suggests at first sight inaccuracy of observation, but I have found 
both globose and elongate pollen in the anthers of the Lancashire 
Naias graminea. The globular form is represented in fig. 79, an 
the elliptical form is given in fig. 80, both drawn to the same scale. 
elliptical form, and that the latter represents the mature pollen, or 
whether there is a dimorphism in the pollen-grain, I cannot 
pronounce ; I can only certify to the occurrence of both forms in 
Plants from the same station, and that the globose form is much 
the rarer of the two. 
_ In its fresh state the pollen-grain is of a pale yellow colour, and 
its contents are granular. It must be produced in great abundance, 
permanent microscopic examination. 
XI1.—Ferrimization, 
Water, as there is rovision for ngation of the peduncle to 
raise the pistilliferous flowers up to the surface of th as i 
P izti, Valisneria, Anacharis, and other aquatic plants. 
interest, as they suggest that pollination is effected in two ways. 
In the station in which the Naias occurs near Manchester the very 
slight natural flow of the water in the canal towards the locks is 
quite sufficient for the transport of the pollen, and, though I have 
not purposely taken some of the canal water to see if it contained 
Journat or Borany.—Vou. 22. [Novemper, 1884.] Y 
