TABLE 3

Frequency of ENs at synaptic forks compared to frequency of ENs along AE and SC segments

	No. of synaptic forks		No. of ENs/μm SC at forks^{^a}	Ratio of EN frequency at forks to EN frequency on
Species	With EN (%)	Without EN (%)	No. of ENs/μm SC at forks^{^a}	AE^{^b}	SC^{^b}
A. cepa	6 (46)	7 (54)	4.62	77.0	12.2
C. betacea	4 (50)	4 (50)	5.00	62.5	8.3
L. esculentum	9 (22)	31 (78)	2.25	10.2	1.6
L. longiflorum	5 (42)	7 (58)	4.17	7.2	2.6
P. nudum	27 (50)	27 (50)	5.00	35.7	4.8
T. edwardsiana	5 (38)	8 (62)	3.85	6.6	2.7

↵^a The length of SC at a synaptic fork was estimated to be about the size of a nodule that equals 0.1 μm.
↵^b From Table 1.