NOTES. 
ON TWO CASES OE LAMINAE ENATIONS PEOM THE 
SURFACES OF LEAVES. i. I have in the front-yard of my 
house a fine specimen of Anthurium crassinervium , Schott, which 
stands exposed to the full heat of our tropical sun. It has actually 
twelve leaves (70 to 75 by 20 to 25 centim.) and has flowered and 
fruited several times. The leaves stand nearly vertical, making angles 
of from 75 0 to 8o° with the horizon, which gives the plant a strikingly 
compact appearance, whilst other specimens growing in the shade 
have a more or less expanded foliage, and do not look so crowded. 
This, of course, is due to the difference of insolation, the leaves of the 
first plant placing themselves to nearly vertical in order to avoid the 
fatal influence of excessive light. The effect is especially noticeable 
in the outer leaves, which bend abruptly in angles from 30° to 40° at 
the petiolary knob. 
On the dorsal surface of two of the leaves there is quite a number 
of curious enations midway between the primary nerves, which form 
boat-like structures, about 2 centim. long, pointed at both ends, and 
measuring 5 to 8 millim. across the middle, whilst the laminar borders 
protrude 4 to 5 millim. from the surface of the blade. The inner side 
of these laminae presents the same appearance as the upper surface of 
the leaf, and their outer side is in every respect equal to its under 
surface. On the corresponding places of the upper surface of the leaf 
there is a linear impression, wholly covered by the epidermis. Two 
of the enations have remained in a very rudimentary state, and consist 
only of the upper impression just mentioned and a somewhat salient 
line on the under surface, which looks like the scar of a cut partially 
healed. 
I had never before seen anything like it, although Anthurium 
crassinervium is a very common plant in our neighbourhood ; nor 
do I remember having met with any published record of a similar 
observation made by others. 
[Annals of Botany, Vol. III. No. XI. August 1889.] 
