6 ART. 3. — K. ONO. 



on the one hand, and that of some hydathodes^^ on the other. 



The second type. 



SUBDIVISION I. 



Prunus yedoetisis. 



The extranuptial nectaries are found in pairs on the top of 

 the petiole, just at the base of the leaf-blade. They are cup- 

 shaped and show sometimes a bright red colour on the surface. 

 The secretory layer consists of a row of prismatic cells, which, 

 gradually lessening in height, pass into epidermal cells. The 

 cuticle is found above the secretory epithelium. 



Just below the secretory epithelium, several layers of sub- 

 glandular cells are found. The main body of the disk is composed 

 of an anastomosing system of conducting parenchyma and ground 

 parenchyma. The conducting parenchyma is arranged just below 

 the layer. The extranuptial nectaries of Mallotus japonicus, Idesia 

 polycarpa, Excoecaria japonica, Aleurites cordata^^ and Prunus 

 p)ersica have a similar structure, while those of Sapium sehiferum 

 and Populus tremula var. mllosa may better be included under the 

 following type, as their secretory epithelium consists not of a 

 single row, but of several rows of cells. 



SUBDIVISION II. 



a. Luffa cylindrical'' 



The extranuptial nectary has several secretory layers, in 

 which the secretory cells are regularly arranged in a row. There 

 exists, just below the secretory epithelium, a certain layer of small 



1) Koorders. Ueber die Bliithenknospen-Hydathoden einiger tropischen Pflanzen 



2) Groom. On the extrafloral nectaries of Aleurites. Ann. of Bot. Bd. S, p. 228. 1894. 



3) Archangeli. Altre osservuzioni sopra alcune Cucurbitacee e sui lovo nettarii. 

 Bull. soc. bot. ital. p. 198. 1899. 



