140 



R. S. Rogen 



I. Petals veflexed. 



Labellum more or less obovate, on a claw shorter 

 than the lamina. A few stalked calli on the 

 proximal end of the claw ; a large prominent, re- 

 flexed, usually green callus at base of lamina ; 

 numerous crowded brown calli of varying shapes 

 and sizes in front of this basal callus extending 

 nearly to the tip 



1. C. diphylla. 



Labellum ovate, on a claw about as long as lamina. 

 One group calli at base of lamina, the most prom- 

 inent of these being a large stalked bilobed gland, 

 the others thick more or less sessile glands, 

 surrounded by small calli with slender stalks ; 

 a second large group of small sessile calli in 

 front of the first extending to tip of labellum 2. C. formicifera. 



Labellum rhomboidal on a claw shorter than lamina. 

 No calli on claw ; lamina with a single, large, 

 stalked, cnmjjound, brown callus near base . . 3. C trapezi/orme. 



II. Petals spreading or ascending. 



Flowers reddish-brown. Petals ascending. Label- 

 lum broadly ovate on a very short claw. A large, 

 brown, long stalked, clavate callus at base of 

 lamina and a short thick,'almost sessile, gland in 

 front of this near the centre ; a somewhat irregu- 

 lar row of small stalked calli on either side of 

 these 



4. C. Gunnii. 



6. C. trilabra. 



Flowers green. Petals spreading. Labellum ovate 

 or very broadly lanceolate, on a very short claw. 

 Lamina with shortly stalked or sessile brown 

 calli irregularly grovxped in centre and at base 5. C. Muelleri. 



Flowers reddish-brown. Petals spreading. Labellum 

 obovate on broad claw. One large reflexed 

 greenish callus at base of lamina, and other 

 large, flat sessile calli along centre surrounded 

 by many small, clavate, stalked calli 



Flowers greenish-bronze. Petals spreading. Label- 

 lum on very short claw. One large, purple, 

 crescentic, sessile callus in middle line in 

 advance of all the othei'S ; another large, bilobed 

 stalked callus about midway between this and 

 base of lamina; numerous stalked calli, small 

 and medium-sized, situated between these two 

 groups ; a somewhat irregular row of small 

 stalked calli running on either side of middle 

 line from bend of lamina to its base ... 



7. C. Pescottiana. 



