MACROSCOPIC AND MICROSCOPIC CHARACTERS OF PLANTS. 



799 



Table J 21. 



Dimensions of leaves: 

 Average length pre- 

 ceding year 



Average length this 



year 



Average width pre- 

 ceding year 



Average width this 



year 



Lengths of flower-stalk 

 and average length of 

 sheathing bracts: 



Length 



Average length 



Length of pedicels and 



number of flowers: 



Length of pedicels. . 



Number of flowers.. 



Length and width of 



dorsal sepal : 



Length 



Width 



Length and width of 

 lateral sepals: 



Length 



Width 



Length and width of 

 lateral petals: 



Length 



Width 



Length and width of 

 labellum : 



Length 



Width 



Length and width of 

 column: 



Length 



Width 



(J. lowianum 



64.3 



45.8 



2.3 



2.4 



G1.5 

 9 



4.5 

 9 



5.9 

 1.6 



5.3 

 1.6 



5.5 

 1.1 



4.3 

 3.2 



3.5 

 0.9 



C eburneum 



cm. 



37.9 

 21.9 



1.4 



1 



17 

 12.9 



3.4 



1 to 2 



6.1 

 2.7 



5.3 

 2.4 



5.7 

 1.9 



4.6 

 3.8 



4.2 

 1.1 



C. eburneo- 

 lowianum. 



54 



27.5 

 1.5 

 1.2 



48 

 10.3 



4.2 

 5 



5.9 

 1.9 



5.4 

 1.8 



5.6 

 1.4 



4.7 

 3.4 



4 



0.9 



C. lowianum has fewer leaves per year-growth than 

 C. eburneum, and in the hybrid the number is mid-inter- 

 mediate between those of the parents. The number of 

 leaves per year-growth are : C. lowianum 7 to 9, G. ebur- 

 neum 15, G. eburneo-lowianum 11 to 12. 



Flower. 



Inflorescence arises from the axil of one of the lower 

 leaves. The flower-stalk is about 0.25 inch in diameter in 

 all three plants, but is much longer in G. lowianum than 

 in G. eburneum, and is between the parents in length in 

 the hybrid, but nearer C. lowianum. It is sheathed at the 

 base by long, narrow, acuminate, membranous bracts 

 which are shorter in C. lowianum than in C. eburneum, 

 and intermediate in length in the hybrid, though nearer 

 G. lowianum. (Table J 21.) 



Smaller bracts are present, one at the base of each 

 flower. The flower is borne on a short, fleshy pedicel 

 which is longer in C. lowianum than in C. eburneum, 

 and though between the parents in length in the hybrid, 

 it is nearer to C. lowianum. The flowers are more numer- 

 ous in C. lowianum than in C. eburneum,, and are fairly 

 mid-intermediate in number in the hybrid. (Table J 21.) 



The dorsal sepal in all three plants is concave and 

 spiculate, bending forward towards the labellum. It is 

 smaller in C. lowianum than in G. eburneum, and in the 

 hybrid it is slightly wider but of the same length as in 

 G. lowianum. (Table J 21.) 



The lateral sepals (spread out toward the sides) are 

 shorter and narrower than the dorsal sepal. They are of 

 the same length but narrower m C. lowianum than in 

 ( '. eburneum, and m the hybrid arc slightly lunger than in 

 either parent and a little wider than in C. lowianum. 

 (Table J 21.) 



The color of the lower (outer) surface of the sepals 

 is an olive-green with very indistinct brownish Inns along 

 the veins in G. lowianum; pale yellowish-green in C. 

 eburneum; and a pale yellowish-brownish-green with 

 reddish-brown lines along the veins in the hybrid. The 

 upper (inner) surface is olive-green with faint brownish 

 lines along the veins in ('. lowianum; ivory-white in 

 G. eburneum; and a pale yellowish-brownish-green with 

 reddish-brown lines along the veins in the hybrid. 

 Though in the hybrid the main color appears to be inter- 

 mediate between those of the parents the brown lines are 

 intensified. 



The petals are longer and narrower than the sepals. 

 They are shorter and narrower in C. lowianum than in 

 G. eburneum and mid-intermediate in length and also 

 very nearly so in width in the hybrid. (Table J 20.) 



The color of the petals is more yellowish and not as 

 green as the sepals in 0. lowianum, ivory-white like the 

 sepals in C. eburneum, and in the hybrid more yellowish 

 but not as green as the sepals. 



The labellum is shorter and narrower in C. lowianum 

 than in C. eburneum. In the hybrid it is longer than 

 in either parent, but the width, though between the 

 widths of the parents, is nearer C. lowianum. (Table 

 J 21.) 



The color of the outer surface of the labellum is very 

 similar in all three plants, an ivory-white with a yellow- 

 ish area near the base, and veins a faint yellow becoming 

 a pale greenish-yellow toward the lateral lobes. Inside 

 at the base the color is yellow, speckled with yellowish 

 red, fading to very pale yellow and becoming a slightly 

 deeper yellow toward the lateral lobes in C. lowianum; 

 ivory-white, becoming pale yellow toward the lateral 

 lobes in C. eburneum; and yellow at the base, speckled 

 with reddish brown, then ivory-white and becoming 

 yellow toward the lateral lobes in the hybrid. Two white 

 ridges arise from 2 flat bands extending along the median 

 line of the labellum, ending in a faintly yellow crest in 

 C. lowianum; there are three yellow ridges, ending in a 

 yellow crest in G. eburneum; and a broad flat band grad- 

 ually rising into 2 yellow ridges with 2 brown specks on 

 the crest in the hybrid. Above the crest is a white area in 

 C. lowianum, corresponding to this is a small yellow spot 

 in C. eburneum, and a paler yellow spot in the hybrid. 

 Extending from between the two crests is a red line and a 

 V-shaped mark of red-crimson in C. lowianum; the cor- 

 responding area is yellow and ivory-white in C. ebur- 

 neum; and a V-shaped mark of dark brownish-red in the 

 hybrid. Between the anterior lobe and each lateral lobe of 

 the labellum is a speckled area. The color of the dots in 

 C. lowianum is yellowish red; in C. eburneum, pale pur- 

 plish; and in the hybrid, reddish brown. 



The column is shorter and narrower in G. lowianum 

 than in C. eburneum. In length it is between the parents 

 in the hybrid, though near C. eburneum; but in width 

 it is identical with C. lowianum. (Table J 21.) 



The color of the column on the inner surface is, in 

 C. lowianum, yellowish at the base with orange-brown 



