No 7 . is, 1924 Asexual Propagation in the Breeding of Rootstoclcs 
521 
The following failed to form either 
callus or roots: Chaenomeles lagenaria 
cathayensis , 2 varieties; Crataegus pin- 
natifida, 1 variety; Ficus carica, 79 
varieties; Prunus amygdalus, 28 varie¬ 
ties; P. persica, 54 varieties; P. per- 
sicaYP- persica nucipersica, 2 crosses; 
P. persica nucipersica, 5 varieties; P. 
subgenus Amygdalus, 8 species; P. 
*armeniaca, 32 varieties; P. avium, 5 
varieties; P. cerasus, 1 variety; P. 
virginiana, 3 varieties; P. domestica, 5 
varieties; P. salicina, 4 varieties; 
Prunus, subgenus Prunophora, 23 spe¬ 
cies, 12 undetermined species; Pyrus, 
subgenus Malus, 5. species, 9 unde¬ 
termined species; P. malus, 6 varieties; 
P. subgenus Pyrus, 2 species, 9 unde¬ 
termined species; P. serotina, 13 varie¬ 
ties; P. communis, 8 varieties. 
SUMMARY OF RESULTS 
Species which formed roots and a 
•callus: Cydonia oblonga, Prunus bes- 
seyi, P. pumila, P. bokhariensis, P. 
’Cerasifera, R.fremonti X P. cerasifera (1), 
P. cerasifera X P. hortulana (The Mari¬ 
anna type), P. mexicana, P. munsoniana, 
P. spinosa, Prunus sp. Discovery plum, 
Pyrus serotina, P. serotina X P. com¬ 
munis. 
Species which formed a callus only: 
‘Chaenomeles lagenaria cathayensis, Pru¬ 
nus fenzliana, P. dasycarpa, P. spinosa X 
P. domestica, P. lycioides, P. subcordata, 
the following unnamed forms of Prunus, 
Gigantic plum, Methley, Alpha, Sharp 
Early, Wright Purple, Best Hybrid, 
SPI Nos. 32751, 47935; Pyrus amygda- 
liformis, P. betulaefolia, P. calleryana, 
P. nivalis, P. phaeocarpa, P. salicifolia, 
P. ussuriensis; the following unnamed 
forms of pears, SPI Nos. 26591, 30308, 
37071, 38799, 44276; Pyrus baccata X 
P. malus, P. pulcherrima , P. sieboldi 
arborescens, P. zumi; and the following 
unnamed forms of apples, SPI Nos. 
22434, 30326, 30353, 30635, 30327, 
40207. 
The following results were secured 
with commercial forms: 
Varieties of Ficus carica which rooted: 
SPI 6243, Archipel, Hamari, Maslin No. 
20 Oeil de Perdrix, Reculver, Warren, 
Xehba. Varieties of Ficus carica which 
formed a callus only: Constantine. 
Varieties of Prunus amygdalus which 
formed a callus: SPI Nos. 7398, 
26543, 33217, and Prunus sp. SPI No. 
28942. 
Varieties of Prunus persica which 
formed roots: F 2 Strawberry X Peento, 
P. persica nucipersica SPI 43141. 
Varieties of P. persica which formed a 
callus only, Family Favorite X Kala¬ 
mazoo, SPI Nos. 33219, 36703, 38469, 
40900, 43130, 43133, 43289, 55564, 
55835; P. persica nucipersica SPI Nos. 
29227, 34685, 43142, 43144. 
Varieties of Prunus armeniaca which 
produced a callus onlv: SPI Nos. 
26048, 28958, 28959, 28960, 28961. 
Varieties of Prunus domestica which 
produced roots: SPI No. 34268, Cly- 
man, Peach Plum, Pond, and Sultan. 
Varieties of P. domestica which pro¬ 
duced a callus only: P. domestica stock 
of Tribble Bros., SPI Nos. 30690, 30692, 
33224, Columbia, Italian Prune (Fel- 
lenberg), Agen (French Prune), Grand 
Duke, Imperial Epineuse, Sergeant, 
Standard, Sugar, Tragedy, Yellow Egg. 
Varieties of Prunus salicina which 
produced roots: Satsuma, Combination 
and Rutland Plumcot. Varieties of 
P. salicina which produced a callus 
only: Abundance, Santa Rosa, Wick- 
son and Climax. 
Varieties of Pyrus communis which 
formed a callus only: SPI Nos. 32736, 
32739, 32745, 32746, 47093, Favorita, 
Anjou, Bartlett, Bloodgood, Fox, Clair- 
geau, Clapp Favorite, Colonel Wilder, 
Colorado Seedless, Lawson (Comet), 
Comice, Dana Hovey, Doyenne d’- 
Alengon, Summer Doyenne, Easter 
Beurre, Flemish Beauty, Forelle, Gif- 
fard, Glou Morceau, Hardy, Howell, 
Kieffer, P. Barry, Seckel, Surprise, 
Winter Nelis. 
Varieties of Pyrus malus which form¬ 
ed a callus only: Chenango, Cliff, Dia¬ 
dem, Early Harvest, General Carring¬ 
ton, Gravenstein, John Sharp, Keswick, 
Maiden Blush, Red Astrachan, Red 
June, Red Spy, Summer Pearmain, 
White Astrachan, Willie Sharp, Yellow 
Transparent, and three plant intro¬ 
ductions of the United States Depart¬ 
ment of Agriculture as follows: SPI 
Nos. 27152, 27153, 35636, 43154, 43155, 
43157, 43164, 43168, 43171, 43173. 
