74 



POLLEN. 



low fovillae, connected by a thin 

 circular plate. b. somewhat 

 opening out in oil ; unaltered in 

 water. 



52. Larix communis, L. ( 6 "^j : #. 

 globular rough, with 3 pores. 

 b. in oil more transparent, c. 

 in vinegar with oily blots dif- 

 fused ; in water globular and 

 clouded. 



OORYLACEJ5. 



53. Corylus avettana, L. (gooo) * " 

 when fresh globular, but rapidly 

 becoming poly hedric, with penta- 

 gonal facets with a pore in each. 



b. in vinegar, c. in oil. d. in 

 water. 



54. Carpinm JBetuliis, L. (^5) : . 

 opaque, globular, b. with 3-loop 

 openings, with a pore in each. 



GTJPULIFER.aE. 



65. Quercus cerris, L. (~) : a. 



oval, with 3 bands and slits, the 

 bands minutely fitted, b. in 

 vinegar somewhat 3-cornered. 



c. in water subspherical, with 

 the remains of 3 pores. 



66. Fagus sylvattca, L. (^) : a. 



broad, oval, with 3 slits, b. seen 

 endwise. 



CYTINACEJE. 



57. Cytinus hypocystis, L. (~) : 

 a. oval, with a pore. b. united 

 in 4 pairs, c. globular in water. 



ARISTOLOCHIACEJ3. 



58. Aristolochia clematitis, L. (~) : 



. opaque, rough globular, b. 2 



bands visible in oil. 

 gar. 



c. n vine- 



59. Aristolochia brasiliensis, Matt. 



and Z. (|j^) : a. globular rough. 

 b. in vinegar with delicate work- 

 ings on the edge. 



EFPHORBIACE2E. 



60. Euphorbia bupleurifolia, Jou. 



(e55o) ' shimn S> yellow, elliptic, 

 with 3 slits ; in water globular 

 clouded. 



61. Poinsettia pulcherrima (^ ); 

 oval, rough, with 3 slits ; in oil, 

 with a margin from the rough- 



62. Mercurialis perennis, L. (^) 



a. smooth, elliptic, with 3 slits. 



b. in oil. c. end up. 



63. Croton humilis, L. (^) ; glo- 

 bular, rough, opaque, with 3 

 slits. 



64. Salix pentandra, L. (^5) : 

 oval, with 3 rough bands, b. 

 end up. c. in oil. d. in water 

 3 bands still visible. 



65. Platanus orientalis, L. (5555) ; 

 a. very minute, oval, opaque, b. 

 in oil, with 3 bands, c. in water 

 spherical. 



BETULACE^;. 



66. Alnus glutinosa, L. (g^j) : a - 

 opaque, polyhedric. b. in water 

 sub-globular. 



ULMACE^E. 



67. Ulmus campestris, L. (gooo) ' 

 globular, rough, with curved 



