22 
DR R. C. DAVIE ON 
The Leaf-Trace in the Monocotyledons. 
Among the Monocotyledons the leaf- traces are composed of large numbers of 
vascular strands (cf. Drtjde, ’89). In the smaller and shorter leaves the strands are 
less numerous than in the long leaves, especially if these have large pinnae. 
Cocos campestris, Mart. 
The leaf-trace of Cocos campestris , Mart., a short-leaved plant with small pinnae, 
has a pair of wide curves, formed of larger strands, crossing from side to side, some 
scattered strands of the same type, and a large number of smaller strands round 
the periphery (text-fig. 14a). The rachis is roughly triangular in outline, and the 
pinnae are inserted at the adaxial corners of the triangle. The pinna-trace is com- 
posed partly of some of the smaller strands of the peripheral series and partly of a 
few of the larger strands from the ends of the two prominent curves (text-fig. 146). 
Phoenix dactylifera, Linn. 
In Phoenix dactylifera, Linn., the petiole is larger and the pinnae are longer than 
in the preceding example. The vascular strands are scattered irregularly in the 
rachis, the smallest being again close to the periphery, the larger ones in the centre 
(text-fig. 15a). 
The pinnae are inserted along the whole width of the lateral faces of the rachis, and 
are supplied partly by the small peripheral strands along the faces and partly by 
larger strands derived from the larger series of the inner region (text-fig. 156). 
Cary ota urens, Linn. 
In Caryota urens, Linn., the pinnae are pinnate and larger than in the two 
species described above. The leaf-trace is composed here also of larger and smaller 
