Doyle — Observations on the Morphology of Larix leptolepis. 327 



12. Fertilization is normal, but the relative sizes of the two male nuclei 

 were not determined. 



13. The pro-embryo is of the Abietinean type. One embryo is the rule. 



14. There is a distinct natural affinity between Larix and Pseudotsuga. 

 This affinity is not recognized in current systematic classifications. 



Finally, I wish to return thanks to Sir Frederick Moore, F.L.S., Eoyal 

 Botanic Gardens, Dublin, for the use of the Larch-trees in the Gardens ; to 

 the Director, Kew Gardens, for the vegetative and cone buds named in the 

 first section of this paper ; and to Miss E. J. Leonard, M.Sc, of the Botanical 

 Department, University College, Dublin, for the drawing of the illustrations, 

 except the photo-micrographs. 



LITEEATUKE CITED. 



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1915. 



2. Cokee, W. C— On the Spores of certain Coniferae. Bot. Gaz., 38, 1904. 



3. Coulter and Chamberlain. — Morphology of Gymnosperms. Revised ed., 



1917. 



4. Coulter, J. M., and Land, W. J. G. — The Gametophytes and Embryo of 



Torreya taxifolia. Bot. Gaz., 39, 1905. 



5. Doyle, J. — Note on the Structure of the Ovule of Lark, leptolepis. Ann. 



Bot., 30, 1916. 



6. ElCHLER, A. W.— Coniferae— in Engler and Prantl's Naturl. Pfl. — Fami- 



lien, 2 1 , 1889. 



7. Hutchinson, A. H.— On the Male Gametophyte of Picea canadensis. 



Bot. Gaz., 59, 1915. 



8. The Male Gametophyte of Abies balsamea. Bot. Gaz., 57, 



1914. 



9. Fertilization in Abies balsamea. Bot. Gaz., 60, 1915. 



10. Morphology of Keteleeria Fortmiei. Bot. Gaz., 63, 1917. 



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 Abietineae. Mem. Bost. Soc. Nat. Hist., 6, 1904. 



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Araucarioxylon Type. Proc. Amer. Acad. Sci. Art., 48, 1912. 



3 g2 



