Ab ee Foal ge ” ih cay =. iy Anon tb ae es ng / wh Ae 7 (fay “fn re oy 
RT aS Pew ye raeNe ig, 2 i, ‘ . : 4) ge ala hy he 
Pas he ts ANY ES Pet 7 my NS fe AW Te 
Yin 2 : . t ‘ ‘ - ‘e Caan | 1245 / 
Re tee. \F ) wa Bae : , A 
Begs hor t ; 
‘ — ON 
ea es The Cell as a Member of a Group. 51 
(Fig. 75), but otherwise of very various structure, are in 
~ contact by their ends, which are either broad or narrow, and 
often form great systems of tubes, which are never associated 
into bundles, but run separately and usually in a parallel 
direction. They occur only in the outer cortex and in the 
foliar organs in most Monocotyledons and in some Dicoty- 
. -ledons. 
 Latictferous vessels are simple or branched tubes, fre- 
quently anastomosing, or united into a more or less close 
network (Figs. 76, 77). They always contain a fluid 
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Fic. 77.—Anastomosing laticiferous vessels from a vein of a leaf of the 
— lettuce. (After Hanstein, x 160.) 
peculiar to the plant, which is often coloured and frequently 
of a milky appearance, and is called /atex. ‘They occur in 
only a comparatively small number of plants, usually in 
the cortex between the bast-bundles and the wood, but 
- sometimes also in the outer cortex, the pith, and the wood. 
_ They accompany the fibrovascular bundles into the leaves. 
- Nearly related to them are the daticiferous cells, long 
» branched simple cells, such as occur in the Euphorbiacee, 
Moracez, Asclepiadese, Aconitum, &c. The latex of different 
- plants contains a great variety of substances: gum, resin, . 
a E2 
