4 POLLEN. 



The simplest form is a bag with one slit, from which the 

 fovilla escapes, then opening out into a hat-shape, like many 

 of the Liliacese and Amaryllidese. 



A similar form is seen in the Magnolia and Nuphar a 

 simple slit. It is curious that the simplest pollen should be 

 found in one of the most ornate and largest of flowers ! 



This simple form is often found with ornate markings on 

 the outside, in the Liliacese, for instance. 



The next simplest form looks at first the same, but on 

 examination it is found to contain three slits or three bands, 

 the bands more or less broad. When floating in olive oil, so 

 that all the sides of the grain are shown, the end is usually 

 somewhat three-cornered, being the ends of the three slits 

 or bands. This is universal, as far as I have seen, in the 

 Saxifragese and Crassulacese, and almost universal in the 

 Rosacese (the Poteriese (Nos. 286-7) and Spiraea palmata 

 (No. 285) are the only exceptions I have seen. Hassall men- 

 tions another form with four slits in Rubus, but what I have 

 examined had the usual simple form) the Scrophulariacese, 

 with the exception of Mimulus, which has three forms, and 

 Browallia, which has many forms ; most of the Solanacese, 

 and all that I have examined of the Melastomacese, are 

 similar, but are the smallest I have seen of this form. It is 

 found in many other families, in which, however, there are 

 also other forms ; as in some Ranunculacese and Sapindacese, 

 and in Spergularia rubra (No. 360) alone of the Caryophylla- 

 cese. The Primulacese have usually three slits, and when 

 seen end up the pollen looks trigonous ; but in some cases 

 they have four or six slits, as remarked by Mr. A. W. Bennett 

 in the ' Nat. Science Review' of 1875. P. cortusoides (No. 

 189) is both simple or trigonous, as I have examined, and as 

 described by Mohl. Mohl and Hassall both describe the pollen 

 of the Graminese as sub-globular, with one pore ; but I have 

 examined numerous specimens, and find it (with the exception 

 of the Panicese, of which I have but seen two) always 

 of one peculiar type of a somewhat prismatic form, with 

 rounded ends, larger at the top, and smaller at the bottom ; 

 while there are four sides with an oval or round opening in 

 them, occasionally 3-sided, 5-sided, 6-sided (No. 104). Mirbel 

 describes the Phleum as I have observed it. Mr. A. W. 

 Bennett describes this form in Briza, but says the Dactylis is 



