100 BOTANICAL GAZETTE [FEBRUARY 
subulata. It is of course impossible to establish absolute identities 
among seedling plants of types which have not yet been seen in 
flower. Consequently the F; progeny of mut. nummularia are 
classified either as true to type or as secondary mutations in 
table I, which shows the composition of the cultures now under 
observation. 
TABLE I 
COMPOSITION OF F; GENERATION OF MUT. nummularia (SEEDLING STAGE) 
Parent Number of seeds| Total plants Phase a rhe 
PERO Oe ees ot 15” 8 6 2 
Reg aay Se i i ge 55° 6 5 I 
Be iol Bes Sahoo ecaiain pees 30° 15 15 ° 
ee ee eee ths 65 9 7 2 
LeeC-3 2 Potro oo 125 38 33 5 
ex Cc ee. be oe 39 14 12 2 
16ers (07 Car 20* 10 8 2 
3 bee pate, 24% 2 2 ° 
ae ihe 11* 5 3 2 
Ae Oe ORS 18* 5 5 ° 
Te eas eee 64 25 15 10 
Lex. C-17XC-21 Total... 137 47 33 14 
het: Cor aia ee 102 36 ai 5 
Grand total. 238 es 403 135 109 26 
* Indicates that the seeds were from one capsule. 
Table I shows that only 34 per cent of the seeds of mut. mum- 
mularia germinated. In order to obtain as many plants as possible, 
a large number of seeds were counted into the seed pans which 
seemed too immature to germinate; 65 such seeds, planted by 
themselves, produced g plants. Part of the seeds planted were 
obtained from self-pollinated capsules, others from capsules which 
had been cross-pollinated. Table I shows that the progeny from 
the self-pollinated seeds includes secondary mutations and typical 
nummularia plants in the ratio1:6. The same ratio for the progeny 
from cross-pollinated seeds is about 1:3.2. Although the differ- 
ence in the ratio seems very marked, it may be due to the fact 
that the germination was poor and the cultures small. 
