Chromosome Homology in Dendrobium — Kamemoto, Shindo, and Kosaki 
107 
TABLE 2 
Hybrids Investigated 
SECTION 
SPECIES CROSSED 
REGISTERED NAME 
Ceratobium x Ceratobium 
D. veratrifolium x D. undulatum 
D. ursula 
D. veratrifolium x D. stratiotes 
D. Sunda Island 
D. veratrifolium x D. tokai 
D. Joanne Sawers 
D. veratrifolium x D. schulleri 
(Not registered) 
D. veratrifolium x D. Taurus* 
D. 100th Battalion 
D. stratiotes x D. tokai 
D. stratokai 
D. stratiotes x D. undulatum 
D. Salak 
D. undulatum x D. gouldii 
D. Kakela 
D. taurinum x D. gouldii 
D. T Shioi 
D. mirhelianum x D. Johannis 
D. Kaipu 
Phalaenanthe x Ceratobium 
D. superbiens (natural hybrid) 
D. phalaenopsis x D. undulatum 
D. Pauline 
D. phalaenopsis x D. gouldii 
D. Jaquelyn Thomas 
D. phalaenopsis x D. tokai 
D. Hawaii 
D. phalaenopsis x D. taurinum 
D. Sanders Crimson 
D. phalaenopsis x D. Johannis 
D. David Baver 
D. phalaenopsis x D. veratrifolium 
D. Luisea 
Latourea x Latourea 
D. atroviolaceum x D. macrophyllum 
D. New Guinea 
Ceratobium x Latourea 
D. lasianthera x D. macrophyllum 
D. Kona 
Phalaenanthe x Latourea 
D. phalaenopsis x D. New Guinea 
D. 50th State 
* D. Taurus rr D. taurinum x D. undulatum. 
in D. phalaenopsis x D. johannis, and disclosed 
a rather strong homology of the parental gen- 
omes. D. phalaenopsis x D. taurinum also 
showed a high degree of metaphase pairing. A 
relatively low mean number of bivalents ( 15.7 ) 
was exhibited by D. phalaenopsis x D. gouldii. 
A second plant of the same cross also produced 
a relatively low number of bivalents (17.1). 
Other hybrids averaged from 17.7 to 17.8 biva- 
lents. 
Excepting D. superbiens, all hybrids exhibited 
two or more extremely heteromorphic bivalents 
TABLE 3 
Mean Chromosome Configurations at Metaphase I of Meiosis in PMCs of Species, 2n — 38 
SPECIES 
MEAN CONFIGURATION 
NUMBER OF PMCS 
SECTION 
PER PMC 
OBSERVED 
Ceratobium 
D. gouldii 
19.0 II 
25 
D. grantii 
19.0 II 
25 
D. stratiotes 
19.0 II 
25 
D. strebloceras 
19.0 II 
25 
D. tokai 
19.0 II 
25 
D. undulatum 
19.0 II 
25 
D. veratrifolium 
19.0 II 
25 
Phalaenanthe 
D. bigib bum 
19.0 II 
25 
D. phalaenopsis 
19-0 II 
25 
Latourea 
D. macrophyllum 
19.0 II 
25 
