NORWAY MAPLE 183 



or sometimes purplish red beneath, and with hairs on the 

 principal ribs ; petiole firm, but slender, about 10 20 cm. 

 long, green or red. Leaves densely pubescent beneath 

 when young; brown in autumn, and often disfigured by 

 black blotches, due to the parasitic fungus Rhytisnia. 



Venation palmate, of 5 primaries, ending in the points 

 of the lobes ; secondaries pinnate and ending in lobules or 

 teeth, numerous, slightly curved forwards. Tertiaries well 

 developed and rapidly breaking into a fine mesh work. 

 Secondaries on the midrib about i its length apart. 



(/3) Lobes angular, the apex and teeth drawn 

 out into long acuminate points, the sinus 

 ivide and hardly acute. Latex white. 



Acer platanoides, L. Norway Maple (Fig. 47). Large 

 tree, with thin, herbaceous, glabrous leaves, 5 15 x 8 25 

 cm., almost plane, and with the tips of the lobes and teeth 

 drawn out into filiform points. Leaf rounded, with cordate 

 base, bright green on both surfaces, and glabrous; or 

 pubescent on the venation beneath. The 5 7 lobes and 

 the teeth triangular; or the larger lobes with nearly parallel 

 sides, and separated by a rounded scallop-like or wide and 

 scarcely acute sinus, extending not more than a third of 

 the way in. Petiole about 520 cm. long and slender, 

 devoid of a tuft of hairs where it joins the lamina, often 

 red. Spring foliage greenish yellow : autumn leaves fine 

 yellow. 



Venation palmate, like A. pseudoplatanus, but the 

 sinus between the lobes much more open, and the lobes 

 and teeth more triangular and prolonged into slender 

 points. The secondaries on the midrib about the length 

 of the latter apart. 



