MR. PERCY GROOM ON BUD-PROTECTION IN DICOTYLEDONS. 268 
row of five or six conspicuous yellow colleters (fig. 25). Тһе colleters are more or less 
pear-shaped; or they may be lobed, as if two colleters were fused. In structure the 
colleter is a typical villus, but a vascular bundle runs for some distance in the axis of 
the colleter. Raphides do not occur in the villus. Villi are also present on the 
calyx. 
GUTTIFER®. 
Clusia rosea has opposite stalked leaves. On the dorsal (upper) face of the leaf-stalk 
base is a peculiar whitish “cushion” of tissue, which is hollowed out somewhat in the 
form of a boat. In addition there is a transverse row of colleters situated nearer the 
point of attachment of the leaf. 
Bud.—Many shoots terminate in two leaves, the cushions of which are closely applied 
so as to completely enclose the youngest leaves and growing-point (cp. figs. 26 & 28). 
As growth continues the “cushions” gradually separate, and the next pair of leaves 
emerges through the gaping slit thus formed (fig. 27). Тһе lateral buds are in addition 
protected by a peculiar “ prophylla” ($. е. first leaves of the branch), which are small 
and sessile (fig. 29). | 
Structure of Colleters.—The colleters are abnormalin structure. Тһе typical palisade- 
layer of secreting-cells has become split into several layers of cells arranged at right 
angles to the surface. Тһе conducting parenchyma is present as usual (figs. 30 & 31). 
In the other colleters the secretion may be seen arising in a lysigenous manner in the 
secreting layers, and forming irregular star-like masses. - 
Structure of the Cushion.—The epidermis of the * cushion" is composed of narrow 
cells with their long axes directed at right angles to the surface. "There is a thick 
cuticle. Between this layer and the ordinary parenchyma of the leaf-stalk lie several 
layers of elongated, thick-walled, parenchyma-cells. The walls of these cells contain a 
considerable amount of water and are copiously pitted. Protoplasmie strands pass into 
the pits and to (through?) the membranes. Тһе cells contain resin, tannin, sphero- 
crystals, and gummy mucilage. Тһе internal Secretory passages pass right in amongst 
these cells, as if to conduct their products thither. 
_ Loganiacee.—I noticed two Fagreas in the houses at Kew in which the bud-pro- 
tection is precisely similar to that in Clusia as far as external features go. Тһе young 
buds, too, seemed to be coated with secretion, so probably colleters are present. 
Unfortunately I was unable to obtain a bud for examination. (I have in Hong Kong 
observed colleters in some other Loganiacee.) 
DILLENIACE Л. 
Wormia Burbidgei is a native of Borneo, with alternate leaves. Examining the ` 
ends of the shoots at first no buds are visible; but a glance at the youngest leaf 
visible reveals the fact that the youngest leaves are stowed away in it. What look 
like the right and left halves of the basal part of the lamina are folded over towards 
the dorsal (upper) face of the leaf, and are fused to form a cylindrical chamber 
(fig. 32), which has a narrow slit-like aperture at its top. The chamber is found to 
SECOND SERIES.—BOTANY, VOL. III. 2 - 
