163 



The normal leaf (fig. 71) is nearly sessile and has a pinnati- 

 fid-pinnatipartite blade. Each of its lobes receives a lateral vein 

 springing at right angles from the midrib. Between two suc- 

 cessive veins springs a thinner one, which at a short distance 

 bifurcates and sends its upper branch into a prickle but the 

 lower one to the adjoining main lateral vein. The apex is 

 long and narrow and terminates in a prickle. Length of the 

 leaf 2 dM. 



I. In a specimen (cultivated in a pot) consisting of an un- 

 branched stem only, the highest and the lowest leaf-pairs 

 were normal, but the 3 middle pairs showed deviations. 

 a) lowest pair. One leaf (fig. 72) in very small (10 X 

 12 mM.), the opposite one (fig. 73), 12V', cM. long, has 

 an abnormal venation, for the lowest pair of lateral nerves, 

 instead of reaching the lowest lobes, bends upwards sen- 

 dins branches to those lowest lobes. Also the rest of the 

 blade shows disturbances consisting of the inteijacent 

 veins and their regular branches having been replaced 

 by an irregular system of anastomoses. 



h) Leaves 9^ , cM. long (fig. 74). The two lowest lateral 

 veins are as thick as the midrib and proceed as far as 

 the top; from here branches go to the lateral lobes. 



c) Leaves 7^ 2 and 6 cM. long (fig. 75). Lowest lateral 

 veins bent upwards, venation however not quite as regular 

 as in the preceding pair. 

 U. Midrib split up as far as i cM. from the apex and with 

 it the blade. The two tops turn their dorsal surfaces 

 towards one another, as may be sufficiently illustrated 

 by figures 76 and 77 '). 



Hemiyraphis cohrata Hallier f. 

 Habitat Java. 

 Coll. April 1S94. 



1) Compare Pexzig II, p. 227 where he mentions an observation by ilagnus : 

 „an der Oberseite eines Acanthus-blattes eine grosse, doppeltflugelige, blattartige 

 Excrescenz, darch Spaltang als Verwachaangsnaht entstanden". 



