Germination of Forest Trees 39 
TABLE II 
Tue Errect oF Light on GERMINATION 
Rocky Mountain Species 
Open Light Medium Shade | Dense Shade 
Species 2 : a |S ; =| ra 
pecie 3 Su loun|8 |] agu|/Da/—-8 |] esgauldal|a 
| asaya ean ume |e (eve es a 
Pinus ponderosa.......... S.D. TO | 32 | 58.0] ro | 22 | 56.5) 10 | 34 | 58.5 
IAVDUS POWWOAOS. oad 00608 Harney | 14 | 14 | 52.0) 8 | 26 39) 8) 26) (6220 
TAVWUS POWGEYOS Wt N.M. | 14 | 40 | 56.0) 12 | 32 | 82.0) 10 | 12 | 70.0 
Pseudoisuga taxifolia...:..| N.M. | 12 | 26 | 63.0] 10 | 12 69.0) 10 | 16 | 65.0 
Pseudotsuga taxifolia...... Colo; |) #2} AD | Ox} we || Bo 73-5) 8 | 36 | 82.0 
VAIDVESNGONGOLOV eee el Colo. | 24 ; 50 | 38.0) 18 ; 56 | 54.0) 14 | 60 | 56.0 
IEVPUS COMO. 6 so 65000 5 Colo. 14 |) SO) | BAO) uO |) Go) Fas aeAal |) GN Babs 
' Pinus ponderosa.......... Mon. | 18 | 22 | 10.0] 18 | 54 | 15.0) ro 8 | 9.0 
Pseudotsuga taxifolia...... Mon. | 14 | 34 | 20.5) 12 | 32 |15.5| 12 | 44 | 35.0 
Pseudotsuga taxifolia......| Idaho | 18 | 30 | 20.5| 16 | 64 | 49.0) 10 | 64 | 50.0 
Pinus pondeyosa.......... Idaho | 36 | 52 | 42.0) 24 | 66 | 52.0| 14 | 82 | 43.0 
AOIES RUGS s oo so anne eo Idaho | 36 | 36 | 4.0| 22 | 62 | 16.0] 22 | 60 | 10.0 
Abies lasiocarpa.......... Idaho | 30 | 30 | 6.0] 26 | 50 | 7.0| 22 | 28 | 6.0 
ECU SMO TULU COLO ter ene Idaho | 24 | 50 | 22.5] 16 | 58 | 20.0] 14 | 60 | 36.5 
In Table II 12 species out of a total of 14 germinated first in 
the dense shade, the other two germinated simultaneously in the 
dense shade and open light. The number of days difference 
between the two cultures varied from 2 to 22 days. Pinus pon- 
derosa (Harney) germinated 6 days earlier in the dense shade 
than in the open light, Pinus ponderosa (N. M.) 4 days, Pseu- 
dotsuga taxifolia (N. M.) 2 days, Pseudotsuga taxifolia (Colo.) 
4 days, Abies concolor to days, Pinus ponderosa (Mon.) 8 days, 
Pseudotsuga taxifolia (Mon.) 2 days, Pseudotsuga taxifolia 
(Idaho) 8 days, Pinus ponderosa (Idaho) 22 days, Abies grandis 
14 days, Abies lasiocarpa 8 days, and Pinus monticola 10 days. 
The medium shade cultures in most cases represent a condition 
intermediate between the open light and dense shade. 
In 10 species out of 14 the germination period was longer in 
the shade than in the light. In 6 species the germination per cent. 
was higher in the dense shade than in either of the other two cul- 
tures and in 12 cases out of 14 the highest per cent. was in either 
of the two shade cultures as against the light culture. In other 
