POLLEN. 5 



oval ; but I think he cannot have floated it in oil, or he would 

 have seen the same form as in Briza. I fancy that Mohl and 

 Hassall chanced merely to see the upper side. 



Arundinaria, Lagurus, and Pogonatherum have a 6-sided 

 prism, as represented by Mr. W. Smith. The only Panicum 

 I have examined is P. plicatum (No. 5), which is quite dif- 

 ferent from any of the other Graminese, being globular with 

 three pores ; and there is something of the same kind in 

 Streptium, a S. American genus of the same sub-order. The 

 Cyperacese have two forms one like a drop of water (in 

 Cladiuin and Scirpus) ; in Carex it is somewhat prismatic, 

 with a pore in each facet, which is the form of the Juncacese. 

 Drimopsis in that family is peculiar, like a tooth, a deformed 

 crystal of the Carex type (No. 23). 



To return to the more banded forms. The Papilionaceae 

 have generally three broad bands; when seen endwise the 

 pollen looks trigonous (the Erythrina and Indigofera have 

 really a trigonous form, not cylindrical). Some are broader 

 than others, but of a similar type, which obtains also more 

 or less among the Csesalpiniese, with the exception of the 

 Bauhinia, which is of a very different type, large and spheri- 

 cal, and echinulate, or large and trigonous. The Acacieae are 

 (with the exception of Mimosa pudica and in a few species) 

 composed of nine to twelve or sixteen cells, in squares or pyra- 

 mids, or cubical arrangement. The Cruciferae have also three 

 bands, smooth or rough, usually containing much oil, which 

 is diffused in the olive oil. Schizopetalus is rougher, very 

 richly marked, with no distinct slits (No. 385). Mr. Bennett 

 has remarked the globular form of Pringlia, but it is possible 

 this form has been assumed after being examined under 

 water, or having been preserved in spirit. The Apocynacese, 

 Jasmineae, and Rutaceae, in general are 3-banded, often with 

 rich ornamentation on the outer coat, and containing much 

 oil, which is diffused in olive oil, as is also the case with the 

 very oily Tiliaceae. Adenandra fragans, in Rutaceae (No. 

 315) has two forms, one slightly curved, the other having an 

 additional coat across the lower one : this is also found in 

 the Umbelliferse, which have also three slits, but are gene- 

 rally constricted in the centre. There are several forms of 

 trigonous pollen. The Myrtacese, as far as I have observed, 

 are all the same ; the Proteaceee (except Banksia, which has 



