Table l.--Seed yields seed weight, and seedling emevgence, fov a comparatively self- 

 fertile and a comparatively self-sterile western white pine tree^ 



Polli- : 

 nation : 

 year : 



Type of 

 cross 



: Number of 

 : crosses 



Filled : 

 seed per : 

 cone^ : 



Ho 1 1 ow 

 seed per 

 cone^ 



: Seed 

 : weight^ 



; Seedl ing 



2 3 



: emergence 















Mg. 



Percent 









SELF- 



FERTILE TREE 



58 









1950 



Self 



1 





134 









84 





Outcross 



11 





106 









87 



1954 



Self 



1 





88 



44 



18 



.1 



52 





Outcross 



2 





68 



36 



17 



.4 



42 



1957 



Self 



1 





103 



20 



18 



.2 







Outcross 



1 





121 



4 



19 



. 1 





All years 



Selfs 



3 





108 













Average 



















outcrosses 



14 





98 

















SELF- 



STERILE TREE 



19 









1950 



Self 



1 





24 









83 





Outcross 



18 





35 









84 



1954 



Self 



1 





31 



63 



22 



.4 



58 





Outcross 



1 





61 



14 



22 



. 1 



64 



All years 



Selfs 



2 





28 













Average 



















outcrosses 



19 





49 











^Data from Bingham and Squillace (1955), Squillace and Bingham (1958), and Barnes 

 and others (1962) . 



^Results for groups of outcrosses are average values. 



^Emergence of seedlings in the nursery seedbeds is probably less than their total 

 germination . 



The oldest material reported upon in the literature concerns five 55-year-old 

 Norway spruce {Piaea abies (L.) Karst.) trees in two S^ lines developed by Swedish 

 silviculturist Nils Sylven through self-pollinations made in 1909! Langlet (1940), 

 and later Eriksson and others (1973) reported upon inbreeding effects in this very 

 old material. Andersson (1965) selfed the five trees. Four of the S^'s produced 

 cones, three produced filled S^ seeds. Cone and seed yields are given in "Discus- 

 sion," starting on page 12, where they are compared with those of three other conifers, 

 including western white pine. About one-half, or 21, of the filled S2 seed in three 

 different S2 seed lots germinated in a Jacobsen germinator, but no information is given 

 on their subsequent survival and growth. Andersson noted that a greater reduction in 

 germination occurred between outcrosses and Sj seed than between the Sj and S2 seed. 



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