CHAP. II. 
GLANDS. 
51 
occasionally cupulate, when they receive the name of glandes 
a godet (glandulcB urceolares) from some French writers. 
Warts are the glandes cellulaires of Mirbel ; but they must not 
be confounded with the glandes vasculaires of the same writer, 
which are not mere excrescences of the epidermis, but modifi- 
cations of well known organs. (See Discus, further on.) The 
presence of minute warts upon the surface of a leaf gives rise 
to a peculiar kind of roughness which is called scabrities, and 
such a surface is then said to be scabrous (scaber) : this must 
not be confounded with asperity, 
Papillce (GlandulcB utriculaires of Guettard) are minute 
transparent elevated points of the cuticle, filled with fluid, and 
covering closely the whole surface upon which they appear. 
In other words, they are elevated, distended bladders of the 
cuticle. The presence of papillae upon the leaves of the ice 
plant gives rise to the peculiar crystalline nature of its surface ; 
they also cause the satiny appearance of the petals, upon 
which they almost always exist in great quantities. Link re» 
marks, that the petals of Plantago, which are destitute of pa- 
pillae, are also without the usual satiny lustre of those organs. 
When the papillae are much elongated beyond the surface, as 
in many stigmas, of which they form the collecting fringes, 
they receive sometimes the name of papulce. It should be ob- 
served, that in De Candolle's Theorie EUmentaire, these two 
terms are transposed, each having received the definition be- 
longing to the other. 
Lenticular glands (Lenticelles of De Candolle ; Glandes 
lenticulaires of Guettard ;) are brown oval spots found upon 
the bark of many plants, especially willows : they indicate the 
points from which roots will appear if the branch be placed 
in circumstances favourable to their production. They are 
considered by De Candolle to bear the same relation to the 
roots that buds bear to young branches. (Premier Mem, sur 
les Lentic, in the Ann, des Sciences Naturelles.) It is, how- 
ever, extremely doubtful whether they are anything more 
than portions of the bark, either disturbed by the growth of 
incipient roots, or disorganised by some other unknown 
power. 
E 2 
