64 FORMS OF HAIRS. 
the case (figs. 144 and 145), or branched (figs. 142 and 143). 
The component cells of compound hairs may be also variously 
arranged, and thus give a variety of forms to such hairs. Com- 
monly their cells are placed end to, end in a single row, so that 
the hairs assume a more or less cylindrical form ; but when the 
component cells are contracted at the points where they come 
in contact, they become moniliform or necklace-shaped ( figs. 144 
and 145). When the cells below are larger than those above, so 
that the hairs gradually taper upwards to a point, they become 
conical ; or when gradually larger from the base to the apex, the 
WiGs iol. Fia. 138. Fie. 139. 
} \ Fic. 140. 
2 “al ii 
i 
Fia. 141. ra 
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it 
Fic. 142. Fia. 143. 
Fig. 137. Simple unbranched hair of the common Cabbage.——Fig. 138. 
Forked hairof Whitlow-grass (Draba).——Fgs. 139, 140. Branched stellate 
hairs of Alyssum. Fig. 141. Stellate hairs from Althea officinalis.— 
Fig. 142. Branched hair of a species of Marrubium.——Fig. 143. Branched 
hair of Alternanthera axillaris. From Henfrey. 
hairs are clavate or club-shaped (fig. 146); or when suddenly 
enlarged at their apex into a rounded head, capitate (fig. 147). 
When the terminal cell of a hair is terminated by a hook on 
one side pointing downwards, such hairs are termed wneimate or 
hooked (fig. 148) ; or if ending in two or more hooks at the 
apex, they are glochidiate or barbed (fig. 149). Hairs, again, in- 
stead of being erect, or placed obliquely upon the epidermis, 
may develop horizontally in a more or less circular manner, and 
form stellate hairs, as in the Ivy (fig. 150) ; or two of the com- 
ponent cells may develop in opposite directions from another 
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