BULLIFORM CELLS. 



19 



1°. The leaves of Dactylis 

 glomerata (orchard grass or 

 cock's foot) luive one median 

 band of bulliform cells. 



2°, In Chlon's petrma and Fig. 23.— Cross-seotion of part of a leaf of 



Dactylis glomeratas,\lov/\n^ onebandof buUi- 

 ^.1 „ ■t.i,^^^ i. /^,-,r. «iirl/nQ form cells on the upper side of the middle. 



others there is one mickUe i ^ 38.-(Sudworth). 

 band, and one or more on each side. 

 - 3^. The leaves of Poa 

 pratensis (June grass) and 

 some others have two bands, 

 one each side of the middle. 

 4°. In case ot And ropogon 

 squarrosnm and others 



there is one band each side Fig. 34.-A cross-section of part of a leaf of 



Poa pratensift (June grass) showing one band of 



of the middle and a small bulliform cells each side of the middle. 1 x 75. 



— (Sudworth). 



one at each edge. 



Fig. 25.— A portion of a cross section of a leaf ot PliUiim jmifcHsc (Timothy), show- 

 ing bands of bulliform cells on each side the middle, and others between the veins. 

 1 X 20.— (Sudworth.) 



5®. The leaves of Phleum 2)rafeni<e{TimoW\y), and many others 

 have one band of several shallow cells each side the middle, and 

 others between the veins. 



6°. The leaves of Zea mays (Indian corn), and many others, 

 have a band between each two primary bundles, and above eacb 

 tertiary bundle. 



