Between Drosera filiformis and D. intermedia. 89 



attenuated branches, the majority are long flat ribbons that 

 give off" numerous narrow branches. 



The upper epidermal cells of this area are of varj'ing shape 

 and size, but average 150 X 38 /i. They contain relatively 

 kw scattered small chloroplasts, each 2. 5—3 [i across. Sto- 

 mata are not present over this area. Its outer or lower epi- 

 dermis consists of longer but narrower cells, 185 X 20 /i, 

 which are well filled with large chloroplasts each 7.5—8 // 

 across. Amongst these are a few stomata, each 40 X 23—25 //. 

 More abundant than the stomata are two-celled sessile glands 

 of stoma-like character, each cell being filled with rich finely 

 granular substance, and a highly refractive nucleus. 



The leaves of D. intermedia (Plate XII, Fig. 3) are on the 

 average i y^ inches long, and in the blade \ inch wide. There 

 is a sharp differentiation between petiole and blade, the latter 

 becoming both widened out and glandular at its junction with 

 the former. At the base of the petiole there is, as in D. 

 filiformis, a somewhat quadrangular area, but here the edges 

 slope toward the upper part of the area. It is glabrous 

 throughout, except across the upper transverse boundar}', 

 where are 7 to 10 strong multicellular unbranchcd, or slightly 

 branched, hairs. The epidermal cells are 225// X 28 /i and 

 contain a very few small chloroplasts. 



The lower epidermis of this area consists of elongated nar- 

 row cells measuring 200-325 /^ X i 5 H- It has no .stomata, 

 and instead of the two-celled glands of D. filiformis, are 

 glandular bifid hairs (Plate XII, Mg. 4<f). 



In the hybrid the leaves varj^ considerably according to 

 age and position in the annual rosette, but comparison of its 

 leaves with those of D. filiformis and D. intermedia prove that 

 this variation is an inherited one from both parents. The 

 earlier leaves of the annual rosette in D. filiformis are com- 

 paratively short and taper to a somewhat blunt point, the 

 typical summer leaves may be lo-i i inches long and greatly 

 attenuate at their tips. In D. intermedia the spring leaves 



